rust: update to version 1.64.0.

Pkgsrc changes:
* This package now contains rust-analyzer, so implicitly
  conflicts with that pkgsrc package.  The same goes for
  the rust-src package.
* Add NetBSD/arm6 port
* Add unfinished NetBSD/mipsel port
* Revert the use of the internal LLVM,
  should now build with the new pkgsrc LLVM (15).
* Add depndence on compat80 for sparc64 to fix the build
* Adapt patches
* Add CHECK_INTERPRETER_SKIP for a few (mostly unused) files.
  (A proper fix may come later.)

Upstream changes:

Version 1.64.0 (2022-09-22)
===========================

Language
--------
- [Unions with mutable references or tuples of allowed types are
  now allowed](https://github.com/rust-lang/rust/pull/97995/)

- It is now considered valid to deallocate memory pointed to by a
  shared reference `&T` [if every byte in `T` is inside an
  `UnsafeCell`](https://github.com/rust-lang/rust/pull/98017/)

- Unused tuple struct fields are now warned against in an
  allow-by-default lint, [`unused_tuple_struct_fields`]
  (https://github.com/rust-lang/rust/pull/95977/), similar to the
  existing warning for unused struct fields. This lint will become
  warn-by-default in the future.

Compiler
--------
- [Add Nintendo Switch as tier 3 target]
  (https://github.com/rust-lang/rust/pull/88991/)
  - Refer to Rust's [platform support page][platform-support-doc] for more
    information on Rust's tiered platform support.
- [Only compile `#[used]` as llvm.compiler.used for ELF targets]
  (https://github.com/rust-lang/rust/pull/93718/)
- [Add the `--diagnostic-width` compiler flag to define the terminal width.]
  (https://github.com/rust-lang/rust/pull/95635/)
- [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS]
  (https://github.com/rust-lang/rust/pull/98771/)

Libraries
---------
- [Remove restrictions on compare-exchange memory ordering.]
  (https://github.com/rust-lang/rust/pull/98383/)
- You can now `write!` or `writeln!` into an `OsString`: [Implement
  `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
- [Make RwLockReadGuard covariant]
  (https://github.com/rust-lang/rust/pull/96820/)
- [Implement `FusedIterator` for `std::net::[Into]Incoming`]
  (https://github.com/rust-lang/rust/pull/97300/)
- [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`]
  (https://github.com/rust-lang/rust/pull/97437/)
- [`ptr::copy` and `ptr::swap` are doing untyped copies]
  (https://github.com/rust-lang/rust/pull/97712/)
- [Add cgroupv1 support to `available_parallelism`]
  (https://github.com/rust-lang/rust/pull/97925/)
- [Mitigate many incorrect uses of `mem::uninitialized`]
  (https://github.com/rust-lang/rust/pull/99182/)

Stabilized APIs
---------------
- [`future::IntoFuture`]
  (https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
- [`future::poll_fn`]
  (https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
- [`task::ready!`]
  (https://doc.rust-lang.org/stable/std/task/macro.ready.html)
- [`num::NonZero*::checked_mul`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
- [`num::NonZero*::checked_pow`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
- [`num::NonZero*::saturating_mul`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
- [`num::NonZero*::saturating_pow`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
- [`num::NonZeroI*::abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
- [`num::NonZeroI*::checked_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
- [`num::NonZeroI*::overflowing_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
- [`num::NonZeroI*::saturating_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
- [`num::NonZeroI*::unsigned_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
- [`num::NonZeroI*::wrapping_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
- [`num::NonZeroU*::checked_add`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
- [`num::NonZeroU*::checked_next_power_of_two`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
- [`num::NonZeroU*::saturating_add`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
- [`os::unix::process::CommandExt::process_group`]
  (https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
- [`os::windows::fs::FileTypeExt::is_symlink_dir`]
  (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
- [`os::windows::fs::FileTypeExt::is_symlink_file`]
  (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)

These types were previously stable in `std::ffi`, but are now also
available in `core` and `alloc`:

- [`core::ffi::CStr`]
  (https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
- [`core::ffi::FromBytesWithNulError`]
  (https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
- [`alloc::ffi::CString`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
- [`alloc::ffi::FromVecWithNulError`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
- [`alloc::ffi::IntoStringError`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
- [`alloc::ffi::NulError`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)

These types were previously stable in `std::os::raw`, but are now
also available in `core::ffi` and `std::ffi`:

- [`ffi::c_char`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
- [`ffi::c_double`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
- [`ffi::c_float`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
- [`ffi::c_int`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
- [`ffi::c_long`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
- [`ffi::c_longlong`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
- [`ffi::c_schar`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
- [`ffi::c_short`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
- [`ffi::c_uchar`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
- [`ffi::c_uint`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
- [`ffi::c_ulong`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
- [`ffi::c_ulonglong`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
- [`ffi::c_ushort`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)

These APIs are now usable in const contexts:

- [`slice::from_raw_parts`]
  (https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)

Cargo
-----
- [Packages can now inherit settings from the workspace so that
  the settings can be centralized in one place.]
  (https://github.com/rust-lang/cargo/pull/10859) See
  [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
  and
  [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
  for more details on how to define these common settings.
- [Cargo commands can now accept multiple `--target` flags to build
  for multiple targets at once]
  (https://github.com/rust-lang/cargo/pull/10766), and the
  [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
  config option may now take an array of multiple targets.
- [The `--jobs` argument can now take a negative number to count
  backwards from the max CPUs.]
  (https://github.com/rust-lang/cargo/pull/10844)
- [`cargo add` will now update `Cargo.lock`.]
  (https://github.com/rust-lang/cargo/pull/10902)
- [Added](https://github.com/rust-lang/cargo/pull/10838) the
  [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
  flag to `cargo rustc` to override the crate type.
- [Significantly improved the performance fetching git dependencies from GitHub
  when using a hash in the `rev` field.]
  (https://github.com/rust-lang/cargo/pull/10079)

Misc
----
- [The `rust-analyzer` rustup component is now available on the stable channel.]
  (https://github.com/rust-lang/rust/pull/98640/)

Compatibility Notes
-------------------
- The minimum required versions for all `-linux-gnu` targets are
  now at least kernel 3.2 and glibc 2.17, for targets that previously
  supported older versions: [Increase the minimum linux-gnu
  versions](https://github.com/rust-lang/rust/pull/95026/)
- [Network primitives are now implemented with the ideal Rust
  layout, not the C system layout]
  (https://github.com/rust-lang/rust/pull/78802/). This can
  cause problems when transmuting the types.
- [Add assertion that `transmute_copy`'s `U` is not larger than `T`]
  (https://github.com/rust-lang/rust/pull/98839/)
- [A soundness bug in `BTreeMap` was fixed]
  (https://github.com/rust-lang/rust/pull/99413/) that allowed data
  it was borrowing to be dropped before the container.
- [The Drop behavior of C-like enums cast to ints has changed]
  (https://github.com/rust-lang/rust/pull/96862/). These are already
  discouraged by a compiler warning.
- [Relate late-bound closure lifetimes to parent fn in NLL]
  (https://github.com/rust-lang/rust/pull/98835/)
- [Errors at const-eval time are now in future incompatibility reports]
  (https://github.com/rust-lang/rust/pull/97743/)
- On the `thumbv6m-none-eabi` target, some incorrect `asm!` statements
  were erroneously accepted if they used the high registers (r8 to
  r14) as an input/output operand. [This is no longer accepted]
  (https://github.com/rust-lang/rust/pull/99155/).
- [`impl Trait` was accidentally accepted as the associated type
  value of return-position `impl Trait`]
  (https://github.com/rust-lang/rust/pull/97346/), without
  fulfilling all the trait bounds of that associated type, as long
  as the hidden type satisfies said bounds. This has been fixed.

Internal Changes
----------------

These changes do not affect any public interfaces of Rust, but they
represent significant improvements to the performance or internals
of rustc and related tools.

- Windows builds now use profile-guided optimization, providing
  10-20% improvements to compiler performance: [Utilize PGO for
  windows x64 rustc dist builds]
  (https://github.com/rust-lang/rust/pull/96978/)
- [Stop keeping metadata in memory before writing it to disk]
  (https://github.com/rust-lang/rust/pull/96544/)
- [compiletest: strip debuginfo by default for mode=ui]
  (https://github.com/rust-lang/rust/pull/98140/)
- Many improvements to generated code for derives, including
  performance improvements:
  - [Don't use match-destructuring for derived ops on structs.]
    (https://github.com/rust-lang/rust/pull/98446/)
  - [Many small deriving cleanups]
    (https://github.com/rust-lang/rust/pull/98741/)
  - [More derive output improvements]
    (https://github.com/rust-lang/rust/pull/98758/)
  - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
  - [Final derive output improvements]
    (https://github.com/rust-lang/rust/pull/99046/)
  - [Stop injecting `#[allow(unused_qualifications)]` in generated
    `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
  - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
- [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
- [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
- [Optimize `Vec::insert` for the case where `index == len`.]
  (https://github.com/rust-lang/rust/pull/98755/)
- [Convert rust-analyzer to an in-tree tool]
  (https://github.com/rust-lang/rust/pull/99603/)

(he)