COMP: Silence unused variable warnings in release mode.
COMP: Silence unused variable warnings in release mode.

The coordID is only used in debug builds, silence the warnings for
release builds by marking as unused.

Change-Id: I41a5a8e8021cc915f2503b4594b8341c86966eac

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