[v3] -fno-exceptions fixes

[Benjamin Kosnik]

Caught this with a CXXFLAGS="-fno-exceptions -std=gnu++0x" build of the
sources while working on something entirely unrelated. It appears that

testsuite/17_intro/headers/c++200x/all_no_exceptions.cc

did not catch these instances (guess is no template instantiations of
basic_string<char> or alternates.). 

tested x86_64/linux

-benjamin
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