On windows, properly set PYTHONPATH using ";" delimiter.
On windows, properly set PYTHONPATH using ";" delimiter.

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