Jonathan Wakely 4bdb9d618d libstdc++: Enable type traits for wchar_t unconditionally [PR98725]
None of these traits depend on libc support for wchar_t, so they should
be defined unconditionally. The wchar_t type is always defined in C++.

libstdc++-v3/ChangeLog:

	PR libstdc++/98725
	* include/c_global/cstddef [!_GLIBCXX_USE_WCHAR_T]
	(__byte_operand<wchar_t>): Define specialization.
	* include/std/type_traits (__make_signed<wchar_t>)
	(__make_unsigned<wchar_t>): Remove redundant check for
	__WCHAR_TYPE__ being defined.
	* include/tr1/type_traits [!_GLIBCXX_USE_WCHAR_T]
	(__is_integral_helper<wchar_t>): Likewise.
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