[libcxx-commits] [libcxx] [libc++] Fix wchar.h to work with modules (PR #146630)

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matts1 wrote:

I came up with a simpler solution for this error. It's somewhat hacky, but just defining `_LIBCPP_WCHAR_H_HAS_CONST_OVERLOADS` on all build actions meant that instead of defining it multiple times, it defined it zero times. Since it wasn't used, this was a non-issue.

https://github.com/llvm/llvm-project/pull/146630