COMP: Fix buffer lookahead for wrapper-parser include directive.
COMP: Fix buffer lookahead for wrapper-parser include directive.

Commit 8977cc9c did not properly handle the 2-character lookahead
required for handling backslashes while preprocessing included files.
It would sometimes duplicate the character following the backslash.

Change-Id: I9e79d55856870c94ef6433860f66f09fd92fc6bd

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