red dispatcher: Remove unused declaration of red_dispatcher_set_mm_time
red dispatcher: Remove unused declaration of red_dispatcher_set_mm_time

It is not used since c541d7e29dc0053e6434d053a50454bb8a7121e9

Signed-off-by: Pavel Grunt <fbda40b445316123f12a5a6bd7556918ea74f4bc@redhat.com>
Acked-by: Fabiano Fidêncio <2931bae082ef9bc04523ba759c03a4778316d48f@redhat.com>

fgouget/spice,fgouget/spice,SPICE/spice,SPICE/spice,fgouget/spice,SPICE/spice,fgouget/spice