xz: updated to 5.4.6

5.4.6 (2024-01-26)

* Fixed a bug involving internal function pointers in liblzma not
  being initialized to NULL. The bug can only be triggered if
  lzma_filters_update() is called on a LZMA1 encoder, so it does
  not affect xz or any application known to us that uses liblzma.

* xz:

    - Fixed a regression introduced in 5.4.2 that caused encoding
      in the raw format to unnecessarily fail if --suffix was not
      used. For instance, the following command no longer reports
      that --suffix must be used:

          echo foo | xz --format=raw --lzma2 | wc -c

    - Fixed an issue on MinGW-w64 builds that prevented reading
      from or writing to non-terminal character devices like NUL.

* Added a new test.


(adam)