Removed unused VTK_FREE_ARG macro
Removed unused VTK_FREE_ARG macro

It appears nowhere else in the codebase.
Found this dead code using -Wunused-macros.

Change-Id: Ifbd9ab7954463d6b00e3a38ce464b4be5f74eb4d

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