[PATCH] Update newlib so that it passes libc++'s tests

[JF Bastien]

Fix issues that LLVM's libc++ test suite finds when setting newlib as
the C library:
  - limits.h: define LLONG_MIN, LLONG_MAX and ULLONG_MAX for C++11 too.
  - stdint.h: define WCHAR_MIN and WCHAR_MAX according to
__WCHAR_UNSIGNED__ if it is provided, and correct the limit when
unsigned (to 32 all-1 bits, not 31). Make sure stdint.h and wchar.h
are in sync.
  - stdint.h: similarly for WINT_MIN and WINT_MAX according to
__WINT_UNSIGNED__.
  - stdlib.h: define struct lldiv_t, _Exit, atoll, llabs and lldiv for
C99 and C++11.
  - stdlib.h: move wcstold to wchar.h.
  - wchar.h: define WCHAR_MIN and WCHAR_MAX according to
__WCHAR_UNSIGNED__ if it is provided, and correct the limit when
unsigned (to 32 all-1 bits, not 31). Make sure stdint.h and wchar.h
are in sync.
  - wchar.h: define file as in stdio.h.
  - stdlib.h: move wcstold from stdlib.h.

Note that libc++ also needs changes to adapt to newlib's C flavor, I'm
sending a separate patch to the cfe-commits@cs.uiuc.edu mailing list.
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