[Bug target/118813] [14/15 regression] avx512bwintrin.h is not `-Wsystem-headers -Wundef` clean since r14-4490-g03a8504815d539

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118813

--- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
In file included from
/opt/compiler-explorer/gcc-trunk-20250209/lib/gcc/x86_64-linux-gnu/15.0.1/include/immintrin.h:61,
                 from <source>:1:
/opt/compiler-explorer/gcc-trunk-20250209/lib/gcc/x86_64-linux-gnu/15.0.1/include/avx512bwintrin.h:202:5:
warning: '__OPTIMIZE__' is not defined, evaluates to '0' [-Wundef]
  202 | #if __OPTIMIZE__
      |     ^~~~~~~~~~~~
```