Update fann to version 2.2.0 / rev 4 via SR 1286118
    
    https://build.opensuse.org/request/show/1286118
    by user jengelh + anag_factory
    - Name devel packages simply off the SRPM name
      (libfann-devel -> fann-devel).
    - Specfile modernization. (forwarded request 1285372 from jengelh)