Fix GH-10659: hash/xxhash applying build upstream fix

ref: https://github.com/Cyan4973/xxHash/commit/6189ecd3d44a693460f86280ccf49d33cb4b18e1

replacing the C++ compile time assert f

Fix GH-10659: hash/xxhash applying build upstream fix

ref: https://github.com/Cyan4973/xxHash/commit/6189ecd3d44a693460f86280ccf49d33cb4b18e1

replacing the C++ compile time assert for C11 one.

Closes GH-10693.

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Fix compilation on RHEL 7 ppc64le (gcc 4.8)

Fixes GH-10077
Closes GH-10078

hash: Upgrade xxHash to 0.8.1

Signed-off-by: Anatol Belski <ab@php.net>

hash: Implement xxHash

The implementation bundles the xxHash v0.8.0 release and includes all the variants

- xxh32, 32-bit wide
- xxh64, 64-bit wide
- xxh3, 64-bit wide
-

hash: Implement xxHash

The implementation bundles the xxHash v0.8.0 release and includes all the variants

- xxh32, 32-bit wide
- xxh64, 64-bit wide
- xxh3, 64-bit wide
- xxh128, 128-bit wide

An initial hash state can be passed through the options arrray. An additional
functionality not targeted in this implementation is the secret support in xxh3
and xxh128. That can be added at a later point.

The serialization for xxh3 and xxh128 should not be implemented, as the
state would contain the secret. Despite the xxHash is a non crypto
algorithm, the secret would be serialized as plain text which would be
insecure.

Closes GH-6524

Signed-off-by: Anatol Belski <ab@php.net>

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