[libcxx-commits] [libcxx] [libcxx] Define `_LIBCPP_HAS_C8RTOMB_MBRTOC8` to true if compiling with clang (PR #165439)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

Seems like that Clang mistakenly thought that these functions were not in the global namespace when building the module...

https://github.com/llvm/llvm-project/pull/165439