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util: Use ZSTD for shader cache if possible

Dylan Baker requested to merge dbaker/mesa:zstd into master

This allows ZSTD instead of ZLIB to be used for compressing the shader cache.

On a 72 core system emulating skl with a full shader-db (with i965):
ZSTD:
    1915.10s user 229.27s system 5150% cpu 41.632 total (cold cache)
    225.40s user 10.87s system 3810% cpu 6.201 total (warm cache)
    154M (235M on disk)
ZLIB:
    2231.33s user 194.24s system 1899% cpu 2:07.72 total (cold cache)
    229.15s user 10.63s system 3906% cpu 6.139 total (warm cache)
    163M (244M on disk)
ZSTD reused context:
    1888.13s user 231.60s system 5181% cpu 40.908 total (cold cache)
    229.31s user 11.46s system 3853% cpu 6.248 total (warm cache)
    154M (235M on disk)

The apparent size of the zlib cache is 4.6M; the apparent size of the zstd cache is 4.5; the actual size in both of them is 7.1M.

Edited by Dylan Baker

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