trivial: Sync the .spec file with downstream
trivial: Sync the .spec file with downstream

mitya57/appstream-glib,ximion/appstream-glib,ikeydoherty/appstream-glib,ximion/appstream-glib,ikeydoherty/appstream-glib,kalev/appstream-glib,kalev/appstream-glib,ximion/appstream-glib,mitya57/appstream-glib,superm1/appstream-glib,superm1/appstream-glib,hughsie/appstream-glib,hughsie/appstream-glib,hughsie/appstream-glib