security/mdigest: Update to 1.10

Changelog from AN-2022-09-18:
With great sadness we report the death of schilytools main author and
long time maintainer J旦rg Schilling (1955-03-27--2021-10-10).  J旦rg, we
miss you!  After his passing, development has been picked up by a group
of volunteers who would like to keep the project alive and well.  Our
goal is to carefully preserve the portability and compatibility of this
project while extending it to new platforms and implementing new tools
and features that fit the tool set.

As a part of the change in management, the schilytools project has moved
from Sourceforge to Codeberg.

- general: Explain how to contribute and update README

- general: Add list of contributors

- all: Misc spelling fixes
  Submitted by Friedhelm Mehnert.

- all: Update E-Mail address and project URL in many places.
  J旦rg's old joerg@schily.net address is defunct and so is his
  postal address.  As a part of an ongoing documentation cleanup,
  these addresses have been replaced by our new project pages in
  many locations.
  Submitted by Nico Sonack.

- man pages: work around buggy syntax highlighting by adding
  \" " comments into various places.
  Submitted by Nico Sonack.

- RULES: Fix build on macOS 12.4

- RULES: add i386-openbsd-clang.rul
  This should permit compilation on modern OpenBSD using clang as
  the system compiler.

- autoconf: Work around clang bug in #pragma weak detection.
  A clang compiler bug causing a crash in the configure test for
  #pragma weak has been worked around, permitting use of weak
  symbols when compiling with clang.

- libmdigest: Add support for BLAKE2 digests
  Submitted by Nico Sonack.

- libmdigest: Prefer intrinsic for bswap_32 over inline assembly
  This should improve performance slightly when compiling with gcc
  on i386 targets.

- libmdigest: Work around clang bug in #pragma weak

- mdigest: Add support for BLAKE2 digests
  Submitted by Nico Sonack.

- tests: fix arm64/aarch64 architecture confusion on OpenBSD
  Submitted by Nico Sonack.


(micha)