Fix build error preventing mingw _ctypes module from being built on MSVC
Fix build error preventing mingw _ctypes module from being built on MSVC

Todo: re-enable the build of _ctypes for windows build

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