Parse raw strings in included headers for C++11.
Parse raw strings in included headers for C++11.

If the preprocessor finds an #include directive and reads the file
just for preprocessing (i.e. not for parsing), then parse any raw
strings in the file.  This allows for raw strings to appear in the
code as long as they don't appear in any preprocessor directives.

Change-Id: Icb51489f24f6ab1c21b2214a9a180647f7f0bb15

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