Recognize strings returned by setlocale() when using MSVC under MSW too,
if only because it was possible to construct wxLocale using them in the
previous versions and so doing this avoids breaking the existing code.
Also don't assert in FromTag(), even if the input is incorrect, as it is
potentially user-defined (e.g. can come from environment variables under
Unix).
Closes#22247, #22252.
b507c97b92