[PATCH] [libc++] Support newlib as libc++'s C library

[JF Bastien]

Fix issues that LLVM's libc++ test suite finds when setting newlib as
the C library:
  - Work around newlib's limited locale support (which AFAICT is allowed in C).
  - Teach libc++ about the rest of newlib's locale support.
  - Work around newlib's limited support for long double (expecting it
to be double when supported at all).
  - Undefine clearerr/feof/ferror (C allows these to be macros).

Note that newlib also needs changes to update its C99/C11/C++11
support, I'm sending a separate patch to the newlib at sourceware.org
mailing list.
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