Add framework for resolving (pun intended) libc namespace issues, using
wrapper .h files and asm labels to let internal calls resolve directly and
not be overridable or use the PLT. Then, apply that

Add framework for resolving (pun intended) libc namespace issues, using
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@

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More changes to avoid truncating 64 bit pointers to 32 bits and sign-extending
them; allows userland with stack beyond 2GB to run.

zap rcsid.
okay deraadt@ (tested them all)

mips64 is now going ABI64 and shared library support!
String functions need some optimization/rewrite to take full advantage.

Move mips to mips64