* Pybind11Extension add the "/EHsc /bigobj /std:c++14" flags on Windows. This is good for Visual C++ but not for Mingw. * According https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-python2/0410-MINGW-build-extensions-with-GCC.patch sysconfig.get_platform() is the way to check for a Mingw64
