* libc/ctype/iswalpha.c: Fix calls to __jp2uc to pass the
correct type of conversion when dealing with EUCJP or SJIS.
* libc/ctype/iswblank.c: Ditto.
* libc/ctype/iswcntrl.c: Ditto.
* libc/ctype/iswprint.c: Ditto.
* libc/ctype/iswpunct.c: Ditto.
* libc/ctype/iswspace.c: Ditto.
* libc/ctype/towlower.c: Ditto.
* libc/ctype/towupper.c: Ditto.
* libc/ctype/jp2uc.c: Change to use multiple arrays in jp2uc.h.
Also convert to EUCJP before using arrays. For values not in
the conversion arrays, return WEOF.
* libc/ctype/jp2uc.h: Change from one array to a number of
arrays to account for the fact that the originating table
is not contiguous for the input values since some are invalid.
* libc/ctype/ctype_.c: When compiled with gcc on platforms
with signed char, make _ctype_[-128] ... _ctype[-1] refer to
initialized memory region. Platform can define COMPACT_CTYPE
to avoid allocation of the additional 128 bytes of data.
Add pointer to _ctype_ array. Always initialize all _ctype_
array elements.