crypto/x86_64cpuid.pl: suppress AVX512F flag on Skylake-X.
It was observed that AVX512 code paths can negatively affect overall Skylake-X system performance. But we are talking specifically about 512-bit code, while AVX512VL, 256-bit variant of AVX512F instructions, is supposed to fly as smooth as AVX2. Which is why it remains unmasked. Reviewed-by:Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4838)
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