[libcxx-commits] [libcxx] [libcxx] Fix ODR violation in wchar.h (PR #216069)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 commented:

Don't we have a quite similar PR somewhere which gets rid of `<__mbstate_t.h>` entirely instead?

https://github.com/llvm/llvm-project/pull/216069