Handle compiling against 4.X versions of libstdc++
Fixes #447 (closed) This uses a more robust set of checks to determine if std::aligned_union and std::is_trivially_copyable exist given the libstdc++ version value
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Fixes #447 (closed) This uses a more robust set of checks to determine if std::aligned_union and std::is_trivially_copyable exist given the libstdc++ version value