These functions were almost but not quite identical to it:
wxSafeConvertMB2WX() tried the current locale encoding before UTF-8 while
wxConvWhateverWorks tries UTF-8 first and then the current locale encoding.
The latter behaviour is more correct as valid UTF-8 could be misinterpreted as
some legacy multibyte encoding otherwise, so get rid of this difference and
just forward these functions to wxConvWhateverWorks.
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