Add PyXY suffix (python version number) to module libraries.
If a module library has a link dependency on the vtkPython module, then it should have the Python version number as part of its name so that it can coexist with installations of VTK that were built with other versions of Python. This can be done by adding a PyXY suffix to the OUTPUT_NAME, for example, Py27 or Py34:
vtkWrappingPythonCorePy27
vtkFiltersPythonPy27
vtkPythonInterpreterPy27
vtkRenderingMatplotlibPy27