Add C99 standard headers wchar.h and wctype.h
Detail: These were previously languishing in the C compiler sources, but they belong in the C library. Note however that the library does not implement the functions described in these headers at the present time, so any attempt to use them will result in link-time errors. Admin: Untested (known not working) Version 5.83. Tagged as 'RISC_OSLib-5_83'
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