MFC r313819:
Remove outdated claim.

Despite wishful thinking the removal of these old functions hasn't
happened yet.

MFC r297212:

For C++, expose long long types and functions (lldiv_t, llabs, lldiv,
etc) in stdlib.h. These will be needed for newer versions of libc++,
which uses them for defining overloaded versions of abs() and div().

MFC r263998:

Rename __wchar_t so it no longer conflicts with __wchar_t from clang 3.4
-fms-extensions.

MFC r263998:

Rename __wchar_t so it no longer conflicts with __wchar_t from clang 3.4
-fms-extensions.