- Update xz to 5.2.1, where the most visible change is that it
fixed a compression-ratio regression in fast mode LZMA1 and
LZMA2 and used cpuset_getaffinity() for CPU cores detection.
- Make liblzma use the base system SHA256 implementation instead of
the bundled one.
- Additional annotation in config.h for FreeBSD specific tweaks.
- Refresh symbols in XZprivate_1.0 to reflect reality.
Relnotes: yes
MFC after: 1 month (TBD)
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