- update to 2.5.1
    
    - update to 2.5.1 (#821191; see NEW for details)
    - use rpm 4.9.x requires/provides filtering
    - update xdg-open patch
    - drop emacs sub-package; the PARI Emacs shell is now a separate project
    - drop %defattr, redundant since rpm 4.4
    - gp sub-package requires bzip2 for support of bzipped files
    - make %files list more explicit
    - drop redundant buildroot definition and cleaning
    - BR: xmkmf for X11 detection
    - make sure we use our %{optflags} and only those
    - call pari_init_defaults() before gp_expand_path() (upstream #1264)
    - fix scoping issue that manifests as a test suite failure with gcc 4.7.x and
      -ftree-dse (#821918, upstream #1314)
    - fix desktop file categories
    - install site-wide /etc/gprc
    - update FSF address (upstream #1315)
    - fix various compiler warnings (upstream #1316)
    - run the full test suite in %check
    - add buildreqs for data packages needed by full test suite
    - hardcode %{_datadir} in gp.desktop so no need to fiddle with it in %prep