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Find OpenGL libraries in external projects

Kenneth Moreland requested to merge kmorel/vtk-m:reandering-contexts-in-external-project into master

Previously when an external project loaded VTK-m with find_package(VTKm) and then tried to use anything with OpenGL, you would get compiler (and probably linker) errors. The problem was that VTKmRenderingContexts.cmake skipped over the loading of OpenGL libraries because the vtkm_rendering_gl_context target was imported before this code was ever called. Correct the problem by going through the motions of checking OpenGL every time.

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