v3 PATCH to fix libstdc++ build/test with C++11 default compiler

[Jason Merrill]

The first patch adds -std=c++98 for building C++98 sources.

The second patch fixes all but one of the testsuite failures that turned 
up with a compiler that defaults to C++11.

Tested x86_64-pc-linux-gnu, OK'd by Jonathan in Lenexa.
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