python3: Associate correct architecture with python3stub.lib
python3: Associate correct architecture with python3stub.lib

davidsansome/python-cmake-buildsystem,python-cmake-buildsystem/python-cmake-buildsystem,thewtex/python-cmake-buildsystem,adrianbroher/python-cmake-buildsystem,thewtex/python-cmake-buildsystem,jcfr/python-cmake-buildsystem