[PATCH, libstdc++-v3] Fix import of wide character related symbols in stdlib.h wraper

[Andris Pavenis]

include/c_compatibility/stdlib.h imports wide character related symbols
into global namespace unconditionaly which causes libstdc++-v3 build
to fail when one or both of _GLIBCXX_USE_WCHAR_T and _GLIBCXX_HAVE_MBSTATE_T
are not defined.

Included patch changes it to import them into global namespace only
when they are defined in cstdlib

Andris

2016-01-26  Andris Pavenis  <andris.pavenis@iki.fi>

     * include/c_compatibility/stdlib.h: Include wide character related
     definitions only when they are available in cstdlib.

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