Revert "gnome-desktop is obsolete, as GTK 2.x is, porting to GTK 3.x and gnome-desktop3 is recommended. There are no users of this library left in Fedora proper, so EOL."
    
    Still required by:
    $ dnf repoquery --disablerepo='*' --enablerepo=fedora-source --enablerepo=updates-source --archlist=src --whatrequires gnome-desktop-devel
    banshee-0:2.6.2-32.fc30.src
    gnome-desktop-sharp-0:2.26.0-35.fc30.src
    gnome-python2-desktop-0:2.32.0-35.fc30.src
    icewm-0:1.3.8-16.fc29.src
    
    This reverts commit c60e7810138f91f2952ec075faf4cf29b8f85328.