Add new passgameobject_ptr embind benchmark to test smartptr routing in and out of functions.
Remove unused file.
Let libc.symbols use same symbol format as libcxx.

This is just the output of 'llvm-nm -extern-only -defined-only'.
Add musl wchar function implementations.
Add musl multibyte function implementations.
Move wchar,mb stuff to libcextra.
Bump version.