Update to upstream 1.0.rc5
    
    - Update to upstream 1.0.rc5 tarball
    - Add new build requires for new fedabipkgdiff tool:
      python2-devel, rpm-python, python2-mock, koji, pyxdg, python2-unittest2
    - Add new %%{_bindir}/fedabipkgdiff binary and
      %%{_libdir}/libabigail/default.abignore configuration file to the set
      of distributed files.
    - Drop patches that were integrated upstream:
      0001-Bug-19961-Distinguish-between-PI-executable-and-shar.patch
      0002-Bug-19964-Cannot-load-function-aliases-on-ppc64.patch
    
    Signed-off-by: Dodji Seketeli <dodji@seketeli.org>