Ship versioned pathfixX.Y.py in main and non-main Python versions
    
    pathfix.py is a cruicial tool when building Python so it's
    useful to have it also in non-main Pythons without a conflict
    with the main one.
    
    This change is also reflected in %py(3)_shebang_fix macro:
    https://src.fedoraproject.org/rpms/python-rpm-macros/pull-request/72