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Add SharedEnvExtension#gcc_with_cxx11_support? to centralise the logic for checking whether a compiler is known to support C++11. Update logic to accept GCC 4.8 and above (including 6). Thereby also address oversight in #163 where support for GCC 6 was added without updating the C++11 compiler whitelist. Add tests for Superenv#cxx11. Closes #346.