[Bug 278099] outdated version of zstd(1) is kept in the base

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278099

--- Comment #6 from Xin LI <delphij@FreeBSD.org> ---
(In reply to Alexander Motin from comment #3)
For future reference in case someone wanted to give this a shot, the concerns
at OpenZFS[1] was that different versions of zstd may [2] generate different
output for the same data.  When compressed ARC is disabled (enabled by
default), ARC would only have a copy of uncompressed data, but the MAC was
calculated against compressed data, so arc_hdr_authenticate() would see a
mismatch because it's now using a newer version of zstd to compress the data
(for performance reasons, because re-compression is faster than reading the
data back from disk).

[1] https://github.com/openzfs/zfs/pull/11367#pullrequestreview-559645117
further explained in
https://github.com/openzfs/zfs/pull/11367#issuecomment-753517958
[2] https://github.com/facebook/zstd/issues/999#issuecomment-359538229

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