[libcxx-commits] [libcxx] [libc++] Add __iswctype to the locale base API since it's required by <locale> (PR #122168)

[Daniel Thornburgh via libcxx-commits]

mysterymath wrote:

> How does Fuchsia define iswspace_l & friends? I suspect you'd simply need to add a similar definition for iswspace_l.

We get ours from `__posix_l_fallback.h`; I think this patch would need to add a fallback there for `iswctype_l`.

https://github.com/llvm/llvm-project/pull/122168