762001118c
`mbstate_t` needs to be visible to libcpp, even when it is not providing wide character functionality (i.e. `_LIBCPP_HAS_WIDE_CHARACTERS` is turned off) and thus not using any of the C library's wide character functions. There are C libraries (such as newlib-nano/nanolib/picolibc) which do provide their definition of `mbstate_t` in `<wchar.h>` even though they do not come with wide character functions. Since there is a way to conditionally include the C library's `<wchar.h>` only if it exists, we should rely on the fact that if it exists, it will provide `mbstate_t`. Removing this guard will allow using libc++ on top of newlib-nano/picolibc while not breaking the cases where it is used on top of a C library which doesn't provide `<wchar.h>` (since it would then still go look for `<uchar.h>` or error out).
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