COMP: Add a separate custom command for vtkgl.h so that CMake will make targets for it and then make will build it before any source that requires it (such as vtkOpenGLExtensionManager).
COMP: Add a separate custom command for vtkgl.h so that CMake will make
targets for it and then make will build it before any source that requires
it (such as vtkOpenGLExtensionManager).

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