This commit only replaces the bundled source and does not include any
ZFS integration changes. Because the build depends on integration
adjustments, it will fail until the accompanying integration commit is
applied.
Upstream release: https://github.com/facebook/zstd/releases/tag/v1.5.7
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Moch <mail@alexmoch.com>
Closes#18089
