[vtkusers] Deprecate VTK_RENDERING_BACKEND=OpenGL

[Dan Lipsa]

Hi all,

We are working to deprecate the legacy rendering backend in VTK.

https://gitlab.kitware.com/vtk/vtk/merge_requests/3262

After this merge request is in, you'll get warnings if you compile
using VTK_RENDERING_BACKEND=OpenGL.

As with other legacy features, you can silence the warnings by setting
VTK_LEGACY_SILENT=ON

You can remove legacy features by defining
VTK_LEGACY_REMOVE=ON
In this case, you'll get an error and will be automatically switch to
VTK_RENDERING_BACKEND:STRING=OpenGL2


Thanks,
Dan
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