interface/python.cc: use has_user_pointer
interface/python.cc: use has_user_pointer

Replace the logic which determines whether a method has a
"void *user" pointer by a call to the generator::has_user_pointer
predicate.

Signed-off-by: Armin Größlinger <20499c970f7c0eda8225790b08562c50f62bf51a@uni-passau.de>
Signed-off-by: Andreas Simbuerger <4e36f5f0582938a4a7f28b9e3a851ef9b04efad3@fim.uni-passau.de>

simbuerg/isl,simbuerg/isl,simbuerg/isl,simbuerg/isl,simbuerg/isl