Add option to disable avx512 GEBP kernels

b-shirequested to merge
b-shi/eigen:disablegebpavx512 into master

Reference issue

Issue mentioend here.

What does this implement/fix?

This is a quick fix by allowing enabling/disabling of AVX512 GEBP kernels via compiler flag.

Additional information

Fixed some some undef warnings when avx512 trsm kernels are enabled, but not using clang.

Edited by b-shi

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