ENH: suppress type qualifier warning for gcc
ENH: suppress type qualifier warning for gcc

Added a supression of 'type qualifiers ignored on function return type'
that gcc 4.3 (and later) complains about with the 'void const' return
type of the TestCxxFeatures.cxx funciton TestVoidConstReturn().

Change-Id: Ibd963832fc7e604da1ceec6633b9deda032839a6

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