Update spamassassin to rev 89 via SR 1045241
    
    https://build.opensuse.org/request/show/1045241
    by user adkorte + dimstar_suse
    - Add BuildRequires Text::Diff that was accidentally removed from
      original submission
    - Update known warnings
      % spamassassin-rpmlintrc
    - Update to spamassissin 4.0.0:
      * Notable internal changes:
        - Meta rules no longer use priority values, they are evaluated
          dynamically when the rules they depend on are finished
        - DNS and other asynchronous lookups like DCC or Razor2 plugins
          are now launched when priority -100 is reached. This allows
          short circuiting at lower priority without sending unneeded
          DNS queries
        - New internal Mail::SpamAssassin::GeoDB module supporting
          RelayCountry and URILocalBL plugins provides a unified
          interface to Geographic IP modules. These include:
            MaxMind::DB::Reader (GeoIP2)
            Geo::IP
            IP::Country: