cmake: remove arguments from else and endfoo in png
cmake: remove arguments from else and endfoo in png

Change-Id: I0a402f09120aac24e6a5accb4da66fdf81f0000c

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