There is no need of dynamic allocation as dcl is a small singleton.
Static allocation reduces code size and makes hacking with ui/cocoa a
bit easier.

Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Message-Id: <20210219084419.90181-1-akihiko.odaki@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>