lint: update filter rules
    
    We removed '%{_emacs_version}' in 3395646 (remove --with/--without emacs
    build conditional, 2022-06-13).  Drop the unnecessary filter from the
    rpmlint config.
    
    Add filters for several new checks in rpmlint 2.x: files-duplicate;
    package-with-huge-docs; and potential-bashisms.
    
    Also ignore unused-direct-shlib-dependency for libpcre2.  While this
    is accurate, the additional linking would be tricky to remove from the
    upstream Makefile.  It would almost certainly not be worth the effort.
    
    Lastly (even though it's the first line in the file), drop the unneeded
    'from Config import *' directive.  The rpmlint config is no longer
    loaded directly as python code (yay!).