Left over from the following commits:

8465ee78 xwin: Remove native GDI engine (v2)
c79f824b xwin: Remove primary DirectDraw engine

v2: drop leading - in the makefile

Cc: Adam Jackson <ajax@redhat.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Jon Turney <jon.turney@dronecode.org.uk> (v1)