Update to Zstandard 1.4.5

As usual, the full release notes are found on Github:

https://github.com/facebook/zstd/releases/tag/v1.4.5

Notable changes include:

* Improved decompress performance o

Update to Zstandard 1.4.5

As usual, the full release notes are found on Github:

https://github.com/facebook/zstd/releases/tag/v1.4.5

Notable changes include:

* Improved decompress performance on amd64 and arm (5-10%
and 15-50%, respectively).
* '--patch-from' zstd(1) CLI option, which provides something like a very fast
version of bspatch(1) with slightly worse compression. See release notes.

In this update, I dropped the 3-year old -O0 workaround for an LLVM ARM bug;
the bug was fixed in LLVM SVN in 2017, but we didn't remove this workaround
from our tree until now.

MFC after: I won't, but feel free
Relnotes: yes

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Update to Zstandard 1.4.4

The full release notes can be found on Github:

https://github.com/facebook/zstd/releases/tag/v1.4.4

Notable changes in this release include improved decompression speed

Update to Zstandard 1.4.4

The full release notes can be found on Github:

https://github.com/facebook/zstd/releases/tag/v1.4.4

Notable changes in this release include improved decompression speed (about
10%). See the Github release notes for more details.

MFC after: I'm not going to, but feel free
Relnotes: yes

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Update to Zstandard 1.3.4

Includes our local patch to conditionalize use of __builtin_clz(ll) on
Clang's __has_builtin() (which is just defined to false when building with
GCC).

The issue is tracke

Update to Zstandard 1.3.4

Includes our local patch to conditionalize use of __builtin_clz(ll) on
Clang's __has_builtin() (which is just defined to false when building with
GCC).

The issue is tracked upstream at https://github.com/facebook/zstd/pull/884 .
Otherwise, these are vanilla Zstandard 1.3.4 files.

Reported by: allanjude, Yann Collet
Sponsored by: Dell EMC Isilon

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Merge ^/head r325663 through r325841.

Move zstd from contrib to sys/contrib so it can be used in the
kernel. Adjust the Makefiles that referenced it to the new path.

Sponsored by: Netflix
OK'd by: cem@ and AllanJude@