Fix test so that it uses mesa if it is there
Fix test so that it uses mesa if it is there

Wuteyan/VTK,sumedhasingla/VTK,naucoin/VTKSlicerWidgets,jmerkow/VTK,biddisco/VTK,collects/VTK,collects/VTK,gram526/VTK,keithroe/vtkoptix,gram526/VTK,daviddoria/PointGraphsPhase1,daviddoria/PointGraphsPhase1,berendkleinhaneveld/VTK,ashray/VTK-EVM,arnaudgelas/VTK,keithroe/vtkoptix,biddisco/VTK,daviddoria/PointGraphsPhase1,collects/VTK,sankhesh/VTK,biddisco/VTK,daviddoria/PointGraphsPhase1,demarle/VTK,demarle/VTK,naucoin/VTKSlicerWidgets,naucoin/VTKSlicerWidgets,hendradarwin/VTK,msmolens/VTK,berendkleinhaneveld/VTK,collects/VTK,sankhesh/VTK,spthaolt/VTK,sankhesh/VTK,jeffbaumes/jeffbaumes-vtk,candy7393/VTK,sgh/vtk,mspark93/VTK,gram526/VTK,hendradarwin/VTK,jmerkow/VTK,sgh/vtk,Wuteyan/VTK,naucoin/VTKSlicerWidgets,jmerkow/VTK,Wuteyan/VTK,demarle/VTK,daviddoria/PointGraphsPhase1,jmerkow/VTK,ashray/VTK-EVM,hendradarwin/VTK,berendkleinhaneveld/VTK,demarle/VTK,spthaolt/VTK,sankhesh/VTK,demarle/VTK,spthaolt/VTK,sumedhasingla/VTK,keithroe/vtkoptix,collects/VTK,aashish24/VTK-old,aashish24/VTK-old,gram526/VTK,demarle/VTK,msmolens/VTK,sumedhasingla/VTK,SimVascular/VTK,hendradarwin/VTK,berendkleinhaneveld/VTK,gram526/VTK,ashray/VTK-EVM,keithroe/vtkoptix,cjh1/VTK,sgh/vtk,mspark93/VTK,jmerkow/VTK,msmolens/VTK,jeffbaumes/jeffbaumes-vtk,demarle/VTK,spthaolt/VTK,msmolens/VTK,msmolens/VTK,aashish24/VTK-old,mspark93/VTK,jmerkow/VTK,cjh1/VTK,sgh/vtk,arnaudgelas/VTK,biddisco/VTK,hendradarwin/VTK,hendradarwin/VTK,spthaolt/VTK,sankhesh/VTK,Wuteyan/VTK,jmerkow/VTK,SimVascular/VTK,arnaudgelas/VTK,arnaudgelas/VTK,aashish24/VTK-old,berendkleinhaneveld/VTK,hendradarwin/VTK,ashray/VTK-EVM,johnkit/vtk-dev,jeffbaumes/jeffbaumes-vtk,johnkit/vtk-dev,gram526/VTK,candy7393/VTK,johnkit/vtk-dev,sumedhasingla/VTK,jeffbaumes/jeffbaumes-vtk,gram526/VTK,SimVascular/VTK,sankhesh/VTK,sumedhasingla/VTK,Wuteyan/VTK,daviddoria/PointGraphsPhase1,mspark93/VTK,ashray/VTK-EVM,candy7393/VTK,SimVascular/VTK,johnkit/vtk-dev,jeffbaumes/jeffbaumes-vtk,johnkit/vtk-dev,Wuteyan/VTK,cjh1/VTK,candy7393/VTK,ashray/VTK-EVM,mspark93/VTK,collects/VTK,mspark93/VTK,sgh/vtk,keithroe/vtkoptix,jeffbaumes/jeffbaumes-vtk,ashray/VTK-EVM,sumedhasingla/VTK,msmolens/VTK,SimVascular/VTK,candy7393/VTK,sumedhasingla/VTK,keithroe/vtkoptix,biddisco/VTK,biddisco/VTK,msmolens/VTK,Wuteyan/VTK,aashish24/VTK-old,arnaudgelas/VTK,gram526/VTK,msmolens/VTK,ashray/VTK-EVM,cjh1/VTK,aashish24/VTK-old,berendkleinhaneveld/VTK,demarle/VTK,cjh1/VTK,spthaolt/VTK,cjh1/VTK,mspark93/VTK,jmerkow/VTK,sgh/vtk,sankhesh/VTK,keithroe/vtkoptix,johnkit/vtk-dev,biddisco/VTK,keithroe/vtkoptix,SimVascular/VTK,sumedhasingla/VTK,mspark93/VTK,johnkit/vtk-dev,candy7393/VTK,arnaudgelas/VTK,SimVascular/VTK,spthaolt/VTK,naucoin/VTKSlicerWidgets,sankhesh/VTK,candy7393/VTK,candy7393/VTK,naucoin/VTKSlicerWidgets,SimVascular/VTK,berendkleinhaneveld/VTK