[PATCH] Fix libstdc++ testsuite failures in C++11 mode

[Jonathan Wakely]

We have FAILs in two tests that use { target c++11 } but don't
actually compile in C++11 mode. One because default member
initializers make the type a non-aggregate so it can't be
list-initialized and one because it uses std::less<>.

There are also some tests for container adaptors which should not run
in C++98 mode.

Tested powerpc64le-linux, as c++{98,11,14,17}.

Committed to trunk.

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