and remove renameing _Rune* -> _NBRune* namespace protection.
FreeBSD traditionaly exposes struct _Rune* in runetype.h
which included by ctype.h. it may cause conflicting type error
in our cross build process, former we use renaming namespace
to avoid this problem, now i reworked more resonable way.
2. merge rune_local.h to runetype_local.h, and remove it.
3. split bsdctype.h -> bsdctype_{file,local}.h
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