BUG: Fix compilation error when (windows) doesn't know what GL_MULTISAMPLE is (take3).
BUG: Fix compilation error when (windows) doesn't know what GL_MULTISAMPLE is (take3).

aashish24/VTK-old,candy7393/VTK,biddisco/VTK,spthaolt/VTK,ashray/VTK-EVM,SimVascular/VTK,collects/VTK,collects/VTK,daviddoria/PointGraphsPhase1,demarle/VTK,biddisco/VTK,jeffbaumes/jeffbaumes-vtk,demarle/VTK,sumedhasingla/VTK,keithroe/vtkoptix,naucoin/VTKSlicerWidgets,aashish24/VTK-old,biddisco/VTK,gram526/VTK,candy7393/VTK,ashray/VTK-EVM,daviddoria/PointGraphsPhase1,cjh1/VTK,hendradarwin/VTK,biddisco/VTK,SimVascular/VTK,cjh1/VTK,msmolens/VTK,hendradarwin/VTK,aashish24/VTK-old,johnkit/vtk-dev,jmerkow/VTK,candy7393/VTK,cjh1/VTK,demarle/VTK,johnkit/vtk-dev,sumedhasingla/VTK,johnkit/vtk-dev,ashray/VTK-EVM,arnaudgelas/VTK,johnkit/vtk-dev,SimVascular/VTK,ashray/VTK-EVM,sankhesh/VTK,johnkit/vtk-dev,msmolens/VTK,demarle/VTK,sumedhasingla/VTK,daviddoria/PointGraphsPhase1,sankhesh/VTK,daviddoria/PointGraphsPhase1,arnaudgelas/VTK,mspark93/VTK,naucoin/VTKSlicerWidgets,arnaudgelas/VTK,ashray/VTK-EVM,biddisco/VTK,gram526/VTK,spthaolt/VTK,Wuteyan/VTK,SimVascular/VTK,arnaudgelas/VTK,jmerkow/VTK,aashish24/VTK-old,gram526/VTK,daviddoria/PointGraphsPhase1,sankhesh/VTK,msmolens/VTK,demarle/VTK,sankhesh/VTK,candy7393/VTK,keithroe/vtkoptix,gram526/VTK,cjh1/VTK,biddisco/VTK,cjh1/VTK,SimVascular/VTK,hendradarwin/VTK,jmerkow/VTK,aashish24/VTK-old,cjh1/VTK,gram526/VTK,SimVascular/VTK,sumedhasingla/VTK,candy7393/VTK,Wuteyan/VTK,spthaolt/VTK,msmolens/VTK,candy7393/VTK,jeffbaumes/jeffbaumes-vtk,collects/VTK,mspark93/VTK,msmolens/VTK,mspark93/VTK,collects/VTK,mspark93/VTK,Wuteyan/VTK,sankhesh/VTK,naucoin/VTKSlicerWidgets,arnaudgelas/VTK,daviddoria/PointGraphsPhase1,msmolens/VTK,hendradarwin/VTK,sumedhasingla/VTK,Wuteyan/VTK,ashray/VTK-EVM,msmolens/VTK,naucoin/VTKSlicerWidgets,biddisco/VTK,spthaolt/VTK,keithroe/vtkoptix,keithroe/vtkoptix,collects/VTK,demarle/VTK,mspark93/VTK,gram526/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,jeffbaumes/jeffbaumes-vtk,sankhesh/VTK,candy7393/VTK,keithroe/vtkoptix,aashish24/VTK-old,jmerkow/VTK,gram526/VTK,hendradarwin/VTK,spthaolt/VTK,gram526/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,collects/VTK,jmerkow/VTK,jmerkow/VTK,johnkit/vtk-dev,spthaolt/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,spthaolt/VTK,keithroe/vtkoptix,msmolens/VTK,sankhesh/VTK,Wuteyan/VTK,arnaudgelas/VTK,berendkleinhaneveld/VTK,mspark93/VTK,mspark93/VTK,naucoin/VTKSlicerWidgets,ashray/VTK-EVM,hendradarwin/VTK,berendkleinhaneveld/VTK,naucoin/VTKSlicerWidgets,sumedhasingla/VTK,ashray/VTK-EVM,jmerkow/VTK,Wuteyan/VTK,jeffbaumes/jeffbaumes-vtk,mspark93/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK,demarle/VTK,johnkit/vtk-dev,jeffbaumes/jeffbaumes-vtk,demarle/VTK,jmerkow/VTK,SimVascular/VTK,jeffbaumes/jeffbaumes-vtk,hendradarwin/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,candy7393/VTK,Wuteyan/VTK