[Patch] Test and set wchar_t related macros in -fms-extensions mode

[Hans Wennborg]

Hi all,

The attached patch adds tests to check that we set the
_WCHAR_T_DEFINED and _NATIVE_WCHAR_T_DEFINED macros correctly in
-fms-extensions mode, and also teaches stddef.h to set the former when
typedef'ing wchar_t.

Please take a look!

Thanks,
Hans
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