configure: Actually disable soup-gnome if not found
configure: Actually disable soup-gnome if not found

leandrosansilva/ostree,GNOME/ostree,sujitfulse/ostree,leandrosansilva/ostree,resin-io/ostree,sujitfulse/ostree,leandrosansilva/ostree,GNOME/ostree,gatispaeglis/ostree,resin-io/ostree,GNOME/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,sujitfulse/ostree,leandrosansilva/ostree,gatispaeglis/ostree,resin-io/ostree,gatispaeglis/ostree,resin-io/ostree,GNOME/ostree,sujitfulse/ostree,resin-io/ostree,gatispaeglis/ostree,leandrosansilva/ostree,sujitfulse/ostree