This reverts commit da5d00ad0c.
This caused -Wmacro-redefined
```
.../libc/src/string/memory_utils/op_x86.h:31:9: error: '_mm512_cmpneq_epi8_mask' macro redefined [-Werror,-Wmacro-redefined]
^
.../lib/clang/google3-trunk/include/avx512bwintrin.h:294:9: note: previous definition is here
^
```
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