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fix cell coloring of degenerate polygons

Ken Martin requested to merge ken-martin/vtk:degenerate_polys into master

gl_PrimitiveID seems ot not get incremented for degenerate polygons consistently even if the point IDs are different but the ocations are the same. This topic skips rendering any polys that are degenerate based on point locations. It regresses back to OpenGL1 how it triangulates polygons to a simple algorithm as opposed to using vtkPolygon

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