[v3] More of libstdc++/33979 (char_traits, string)

[Paolo Carlini]

Hi,

add, in C++0x mode, char_traits<char16_t>, <char32_t>, and thus u16string, u32string and the __versa_string counterparts. Of course char_traits will eventually use constrexpr...

Tested x86_64-linux, committed to mainline.

Paolo.

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