[libc-commits] [libc] [libc] Fix macro definition hermeticity (PR #114467)

[Nick Desaulniers via libc-commits]

https://github.com/nickdesaulniers approved this pull request.

This is fine to unbreak the build for now.

Longer term, I think the linux specific libc/include/llvm-libc-macros/linux/fcntl-macros.h should be replaced with `#include <asm-generic/fcntl.h>`.  We should not be redefining these ourselves IMO.

https://github.com/llvm/llvm-project/pull/114467