spice-pulse: GSimpleAsyncResult compatibility
spice-pulse: GSimpleAsyncResult compatibility

Avoid breaking build with glib older then 2.32 which is when
g_simple_async_result_set_check_cancellable was introduced.

SPICE/spice-gtk,Fantu/spice-gtk,fgouget/spice-gtk,fgouget/spice-gtk,Fantu/spice-gtk,SPICE/spice-gtk,flexVDI/spice-gtk,fgouget/spice-gtk,Fantu/spice-gtk,flexVDI/spice-gtk,Fantu/spice-gtk,SPICE/spice-gtk,SPICE/spice-gtk