SF #841977 - modulefinder fails to find extension modules in packages
SF #841977 - modulefinder fails to find extension modules in packages

The find_all_submodules() method in modulefinder only
looks for *.py, *.pyc, and *.pyo files.  Python
extension modules are only found if they are referenced
in import statements somewhere.

This patch uses the actual list from imp.get_suffixes().

Backported myself.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator