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This is the same memcpy()-in-hot-path xxHash problem as described
in community/xxhash commit message.
The bug makes "zstd -1" or "zstd -t" ~15% slower on x86_64 though
higher levels (>= 9) are almost unaffected.
Other aport changes:
- make sure zlib/lzma/lz4 support is not compiled in automatically
(status quo, just make it explicit);
- re-enable armv7 since it is certainly well-supported by upstream,
was disabled by some script in the first place and should not be
affected by "Bus error" (i.e. some alignment problem) mentioned in
commit 2bae66907...
- use faster and shorter "make check" (unlike extensive "make test")
on arm* builders.
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