COMP: remove python hooks from loadable module
COMP: remove python hooks from loadable module

Windows will not compile these hooks, and they are not needed
because the python shared libraries can be directly imported
with a line like:

import vtkvmtkCommonPython

Next step will be to make a python module that encapsulates all
the vmtk libraries.

vmtk/SlicerExtension-VMTK,jcfr/SlicerExtension-VMTK