[v3] Avoid debu-mode, -Wall fails

[Paolo Carlini]

Hi,

noticed when testing with CXXFLAGS="-O2 -g -Wall -D_GLIBCXX_DEBUG". The relatively more interesting one is 27_io/basic_istream/extractors_arithmetic/char/11.cc, due to an unused variable warning, which could be fixed by not using everywhere the trick of libstdc++/21674, but only when strictly necessary, for string.

Tested x86_64-linux, committed to mainline.

Paolo.

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