wrapper .h files and asm labels to let internal calls resolve directly and
not be overridable or use the PLT.  Then, apply that framework to most of
the functions in stdio.h, string.h, err.h, and wchar.h.  Delete the
should-have-been-hidden-all-along _v?(err|warn)[cx]? symbols while here.
tests clean on i386, amd64, sparc64, powerpc, and mips64
naming feedback from kettenis@ and millert@
ok kettenis@

brad and millert, with hints from guenther, jmc, and otto I think.
ok previous.

where applicable.

(this follows FreeBSD and Linux. Single Unix 2 is still illogical)

of the code as a large number of similar clauses makes it impossible
to write an ad for a product using the code...

entire trees for testing anyway, I might as well do this intrusive touching
of include files now.  Added openBSD tags.