isxlower/isxupper/isdigit_char/isdigit_int

[Peter S. Mazinger]

Hello!

Any objections if I remove these 2 (as of comments they are only for older 
uClibc compat stuff, not used internally, and the compatibility is 
already broken)

I also want to guard isdigit_char/isdigit_int to be usable only within 
libc (and won't be visible in header)

Peter

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Peter S. Mazinger <ps dot m at gmx dot net>           ID: 0xA5F059F2
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