ENH: In vtkPython.h, don't undef macros before system includes.
ENH: In vtkPython.h, don't undef macros before system includes.

Change-Id: I853d3256e26a5302f34690578717b7e474599e98

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