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libevent: drop queued mouse events

the changeset r541ead66e8af:

"libdraw: make ebread() return buffer immidiately if available"

makes mouse sluggish when the program cant keep up as mouse
events queue up. this more or less restores the original
behaviour but only for mouse events.

--- a/sys/src/libdraw/event.c

+++ b/sys/src/libdraw/event.c

@@ -385,7 +385,12 @@

 	if(Smouse < 0)

 		drawerror(display, "events: mouse not initialized");

-	eb = ebread(&eslave[Smouse]);

+	for(;;){

+		eb = ebread(&eslave[Smouse]);

+		if(!ecanmouse())

+			break;

+		free(eb);	/* drop queued mouse events */

+	}

 	m.xy.x = atoi((char*)eb->buf+1+0*12);

 	m.xy.y = atoi((char*)eb->buf+1+1*12);

 	b = atoi((char*)eb->buf+1+2*12);

-- 

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