rpm: correct AutoRequires filtering on recent Fedora
    
    Recent Fedora releases (F17 and newer) do not need the
    __requires_exclude macro for filtering automatically generated Requires
    for <xlator>.so files anymore. It is already sufficient to filter each
    <xlator>.so from the Provides.
    
    This prevents the following (harmless) warning from being printed during
    build:
    
        Ignoring invalid regex -P ^(?!lib).*.so.*$
    
    Upstream-bug: 972465