[v3] libstdc++/43813

[Paolo Carlini]

Hi,

this is what I did to implement the resolution of lwg 1234. All in all 
pretty straightforward. Note I'm leaving alone for now basic_string and 
all the trickery with its exports (and well, I don't think *that* many 
people are instantiating basic_string for, eg, a pointer type).

Tested x86_64-linux, normal and debug, committed.

Thanks,
Paolo.

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