Update to 6.18.00
    Drop patches accepted upstream:
      root-avoid-gui-crash.patch
      root-doxygen-generation-with-python-3.patch
    Drop patches with alternative fix implemented upstream:
      root-dont-install-eve7-files.patch
      root-ix32-geom-opt.patch
    Drop ppc64 specific workaround (ppc64 no longer built in Fedora or EPEL):
      root-ppc64-doc.patch
    Dropped subpackages:
      root-geocad
      root-graf-qt
      root-gui-qt
      root-gui-qtgsi
      root-io-hdfs
      root-io-rfio
      root-net-bonjour
      root-net-globus
      root-net-ldap
      root-net-krb5
      root-table
    Drop BuildRequires needed by the dropped subpackages
    New subpackages:
      root-graf3d-csg (split off from root-graf3d-gl)
      root-gui-browserv7
      root-tree-ntuple
    Don't build python2-root for Fedora >= 31
    Include desktop and MIME type files in source RPM (removed from source)
    Install man pages in correct directory
    Use correct library names in plugin definitions
    Don't download test input file if it already exists
    Python 3 fixes
    Increase test tolerance (aarch64 and ppc64le)
    Fix GDB pretty printers install name and location