Allow vtkm_find_gl CMake function to be used no matter vtk-m settings
Previously vtkm_find_gl was only usable when rendering was enabled. This is problematic as examples would use vtkm_find_gl even if they didn't use vtkm rendering library.
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Previously vtkm_find_gl was only usable when rendering was enabled. This is problematic as examples would use vtkm_find_gl even if they didn't use vtkm rendering library.