Disable clang 14 warning about bitwise operators in zstd

Parts of zstd, used in openzfs and other places, trigger a new clang 14
-Werror warning:

```
sys/contrib/zstd/lib/decompress/huf_decompress.

Disable clang 14 warning about bitwise operators in zstd

Parts of zstd, used in openzfs and other places, trigger a new clang 14
-Werror warning:

```
sys/contrib/zstd/lib/decompress/huf_decompress.c:889:25: error: use of bitwise '&' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
(BIT_reloadDStreamFast(&bitD1) == BIT_DStream_unfinished)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

While the warning is benign, it should ideally be fixed upstream and
then vendor-imported, but for now silence it selectively.

MFC after: 3 days

(cherry picked from commit 5f2aca83940097d7d23b4137073fb601f8e74232)

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libprivatezstd: Restrict symbol visibility similar to upstream

We have to relax three symbols to dynamically link zstd(1), but the rest
are the same.

pkgbase: Move libprivatezstd from utilities to runtime

libarchive depends on it by default and tar uses libarchive.
So on a update :
1/ runtime contain tar
2/ runtime have libarchive in shlibs_requi

pkgbase: Move libprivatezstd from utilities to runtime

libarchive depends on it by default and tar uses libarchive.
So on a update :
1/ runtime contain tar
2/ runtime have libarchive in shlibs_required
3/ libarchive packages depends on utilities
4/ utilities depends on runtime
5/ kaboom

All users of libprivatezstd (libarchive related stuff and objcopy/ar)
are already in utilities.

Discussed with: bapt

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Only set WARNS if not defined

This would allow interested parties to do experimental runs with an
environment set appropriately to raise all the warnings throughout the
build; e.g. env WARNS=6 NO_WE

Only set WARNS if not defined

This would allow interested parties to do experimental runs with an
environment set appropriately to raise all the warnings throughout the
build; e.g. env WARNS=6 NO_WERROR=yes buildworld.

Not currently touching the numerous instances in ^/tools.

MFC after: 1 week

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Update to Zstandard 1.3.7

Relnotes: yes
Sponsored by: Dell EMC Isilon

lib(private)zstd: Fix riscv build

Link __bswap[ds]i2() intrinsics in to libzstd for riscv, where the C runtime
apparently lacks such intrinsics.

Broken in r330894.

Reported by: asomers
Sponsored b

lib(private)zstd: Fix riscv build

Link __bswap[ds]i2() intrinsics in to libzstd for riscv, where the C runtime
apparently lacks such intrinsics.

Broken in r330894.

Reported by: asomers
Sponsored by: Dell EMC Isilon

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Addd work around for LLVM bug 35023.

Clang crashes when compiling zstd_compress.c with optimization for ARM targets.
https://bugs.llvm.org/show_bug.cgi?id=35023

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@

Follow up on zstd update

Build zstandard with threading enabled