ENH: Pending VTK release does not use the USE_VTK_FILE.
ENH: Pending VTK release does not use the USE_VTK_FILE.

Add a conditional for including USE_VTK_FILE

aylward/ITKTubeTK,thewtex/TubeTK,KitwareMedical/TubeTK,aylward/ITKTubeTK,KitwareMedical/ITKTubeTK,aylward/ITKTubeTK,aylward/ITKTubeTK,KitwareMedical/ITKTubeTK,KitwareMedical/ITKTubeTK,KitwareMedical/TubeTK,thewtex/TubeTK,thewtex/TubeTK,KitwareMedical/TubeTK,KitwareMedical/ITKTubeTK,thewtex/TubeTK,KitwareMedical/TubeTK