BUG: Fix import of vtk modules when built with Qt5 and VTK9
Created by: jcfr
Suggested-by: Andras Lasso lasso@queensu.ca Tested-by: Steve Pieper pieper@bwh.harvard.edu
See https://discourse.slicer.org/t/vtk-python-does-not-import-on-todays-windows-nightly/1868