[patch] c++/65046 Use abi-tag to fix building with -Werror=abi-tag

[Jonathan Wakely]

On 18/03/15 18:16 +0000, Jonathan Wakely wrote:
>This adds the abi_tag attribute in a few places it's missing, so that
>-Werror=abi-tag builds will work after Jason's upcoming patches to
>make functions inherit the tag from their return type.

Jason suggested using an inline namespace instead of tagging types, so
this adds __gnu_cxx::__cxx11, similar to the existing std::__cxx11.

Tested x86_64-linux, committed to trunk.

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