Simplify wctype() and wctype_l(): we have one set of classification
types used by all (== both) locales; put their implementation in one
file and make the mapping static there. The rl_wctype member

Simplify wctype() and wctype_l(): we have one set of classification
types used by all (== both) locales; put their implementation in one
file and make the mapping static there. The rl_wctype member of
_RuneLocale and its initialization go away at the same time.

ok schwarze@

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New POSIX xlocale implementation written from scratch.
Complete in the sense that all POSIX *locale(3) and *_l(3) functions
are included, but in OpenBSD, we of course only really care about
LC_CTYPE

New POSIX xlocale implementation written from scratch.
Complete in the sense that all POSIX *locale(3) and *_l(3) functions
are included, but in OpenBSD, we of course only really care about
LC_CTYPE and we only support ASCII and UTF-8.

With important help from kettenis@, guenther@, and jca@.
Repeated testing in ports bulk builds by naddy@.
Additional testing by jca@, sebastia@, dcoppa@, and others.
OK kettenis@ dcoppa@, and guenther@ on an earlier version.
Riding guenther@'s libc/librthread major bump.

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Wrap <ctype.h> and <wctype.h> so that calls go direct and the symbols not
in standard C are all weak.
Hide several symbols internal to the implementation