COMP: Properly pass parameter to python_patch.cmake

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22828 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: Specify python patch step only if MSVC variable is True

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22829 3bd1e089-480b-0410-8dfb-8563597acbee