Use hash_code from std::type_index on libstdc++ builds
Use hash_code from std::type_index on libstdc++ builds

type_info::hash_code isn't supported with libstdc++

leapmotion/autowiring,codemercenary/autowiring,codemercenary/autowiring,leapmotion/autowiring,codemercenary/autowiring,leapmotion/autowiring,codemercenary/autowiring,leapmotion/autowiring,leapmotion/autowiring,codemercenary/autowiring,leapmotion/autowiring,codemercenary/autowiring