Fix module loading for Infovis examples
Fix module loading for Infovis examples

The super-directory Examples/Infovis/Cxx was loading required
VTK modules and including the VTK_USE_FILE.
Once this file is included, CMake prevents any projects from its
subdirectories from including it again. This would not let the
sub-projects from linking to more modules than the main project.

keithroe/vtkoptix,SimVascular/VTK,SimVascular/VTK,keithroe/vtkoptix,SimVascular/VTK,SimVascular/VTK,SimVascular/VTK,keithroe/vtkoptix,SimVascular/VTK,keithroe/vtkoptix,SimVascular/VTK,keithroe/vtkoptix,keithroe/vtkoptix,keithroe/vtkoptix,SimVascular/VTK,keithroe/vtkoptix