Differentiate between python line number probes and function call probes.
* python/stap-resolve-module-function.py (resolve_patterns): Differentiate
between line number probes and function call probes.
* tapset-python.cxx (python_builder::resolve): Handle the 'call' flag
coming back from stap-resolve-module-function.py.
(python_builder::build): If needed, synthesize a new 'call' component.