[patch] Add <codecvt> and last pieces of C++11 std::lib

[Jonathan Wakely]

On 16/01/15 23:38 +0000, Jonathan Wakely wrote:
>This defines the C++11 header <codecvt> and adds the wstring_convert
>and wbuffer_convert utilities.

I've discovered that wasn't the last piece of the C++11 library, there
were new constructors taking std::string added to std::locale and all
the std::xxx_byname facets.

It would be fixed by the attached patch (tested on x86_64-linux with
old and new std::string), but we're in stage4 now so I'm not
committing it yet.

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