[patch] libstdc++/60326 make_signed/make_unsigned for wide char types

[Jonathan Wakely]

We are missing specializations for wchar_t, char16_t and char32_t.

The preprocessor condition I've added at the top of <type_traits> is
to avoid needing to #include <cstdint>, which drops names in the
global namespace. GCC defines __UINT_LEAST16_TYPE__ and
__UINT_LEAST32_TYPE__ so we can use them, but other compilers may not
(Clang doesn't) so just #include <cstdint> and accept that <stdint.h>
might put its contents in the global namespace.

Tested x86_64-linux, committed to trunk. I'd like to put this on the
branch for 4.9.1 too, but will wait a while.
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