[v3] Update _GLIBCXX_NOTHROW for noexcept

[Paolo Carlini]

Hi,

straightforward update of the _GLIBCXX_NOTHROW macro. Without changing 
anything else, on x86_64-linux it provides the following small but 
measurable improvements to the size of the .so and the .a:

     .so: 6223484 -> 6223156
     .a: 15183284 -> 15182676

Tested x86_64-linux, committed.

Thanks,
Paolo.

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