Replace the PackageKit dependency in PackageKit-backend-devel
    
      with a dep on PackageKit-glib-devel (which it needs for its
      packagekit-plugin.pc file) to stop the multiarch composer from
      pulling in conflicting PackgeKit packages. (#972571)
    - Add %{?_isa} to dbus-devel and sqlite-devel deps.
    - Fix group tag for -docs subpackage.
    - Drop base package dep in -docs subpackage.