WIP: ENH: Remove vtk_module_config stub
As a follow-up to bbc5c5c2155117647e1d72ac709a0381b706b94d, since we already use the updated target names across versions, we do not need to stub vtk_module_config.
We now always use the OpenGL2 VTK_RENDERING_BACKEND with VTK 7 or later.
Closes #843
This is with VTK 8.1.1.
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Todo: split this into two patches, one that removes the vtk_module_config stub, and one that always uses the OpenGL2 backend.
Manual testing (sorry for the hijack):
Do: check
Do: check
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