Commit dd2c9df0 (Cleanup building of static modules for Python,
2012-08-02) dropped use of python_add_module but did not port all
functionality to the new macro.  Add a missing property to remove the
"lib" prefix from python module names.  Otherwise they cannot be
imported by python.

Change-Id: Ica3539fbb86a4147499e4bedb7dfe3900a645896