Ifdef out some code for OpenGLES systems
Ifdef out some code for OpenGLES systems

Change-Id: I6058a1b2623886eab93d7014d11d777144be612d

hendradarwin/VTK,mspark93/VTK,sankhesh/VTK,sumedhasingla/VTK,ashray/VTK-EVM,demarle/VTK,SimVascular/VTK,johnkit/vtk-dev,demarle/VTK,msmolens/VTK,gram526/VTK,candy7393/VTK,SimVascular/VTK,msmolens/VTK,candy7393/VTK,sankhesh/VTK,jmerkow/VTK,ashray/VTK-EVM,johnkit/vtk-dev,msmolens/VTK,candy7393/VTK,msmolens/VTK,jmerkow/VTK,SimVascular/VTK,demarle/VTK,SimVascular/VTK,ashray/VTK-EVM,sankhesh/VTK,keithroe/vtkoptix,johnkit/vtk-dev,mspark93/VTK,gram526/VTK,gram526/VTK,keithroe/vtkoptix,sankhesh/VTK,ashray/VTK-EVM,sumedhasingla/VTK,demarle/VTK,candy7393/VTK,sumedhasingla/VTK,SimVascular/VTK,gram526/VTK,SimVascular/VTK,sumedhasingla/VTK,johnkit/vtk-dev,ashray/VTK-EVM,demarle/VTK,candy7393/VTK,sankhesh/VTK,candy7393/VTK,sankhesh/VTK,jmerkow/VTK,candy7393/VTK,mspark93/VTK,sankhesh/VTK,demarle/VTK,demarle/VTK,gram526/VTK,msmolens/VTK,ashray/VTK-EVM,sumedhasingla/VTK,mspark93/VTK,gram526/VTK,keithroe/vtkoptix,demarle/VTK,SimVascular/VTK,hendradarwin/VTK,hendradarwin/VTK,keithroe/vtkoptix,gram526/VTK,gram526/VTK,hendradarwin/VTK,jmerkow/VTK,hendradarwin/VTK,keithroe/vtkoptix,johnkit/vtk-dev,msmolens/VTK,hendradarwin/VTK,keithroe/vtkoptix,mspark93/VTK,ashray/VTK-EVM,jmerkow/VTK,sankhesh/VTK,jmerkow/VTK,mspark93/VTK,keithroe/vtkoptix,candy7393/VTK,msmolens/VTK,hendradarwin/VTK,mspark93/VTK,johnkit/vtk-dev,jmerkow/VTK,msmolens/VTK,sumedhasingla/VTK,mspark93/VTK,jmerkow/VTK,SimVascular/VTK,ashray/VTK-EVM,sumedhasingla/VTK,sumedhasingla/VTK,johnkit/vtk-dev,keithroe/vtkoptix