Remove redundant wchar_t and win_t definitions
Typically with libc implementations, wchar_t and co are either defined entirely by the libc or, under libc's arrangement, by headers supplied by the compiler. Things like dlmalloc in relibc need these definitions from relibc itself and that's already already furnished by relibc's stddef.h. These additional definitions here are redundant and collide with compiler headers - for example: onig_sys (something that uutils depends on) breaks. Instead, this patch makes the compiler headers define things appropriately.
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