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games/juggle, games/catclock: keep up with queued mouse events

many queued mouse events delay eresize() because
new ebread() takes from the queue first before attempting
to read from the event pipe. this is a waste of memory, so
just process (dequeue) all the events as long as there are
any on each iteration.

--- a/sys/src/games/catclock.c

+++ b/sys/src/games/catclock.c

@@ -118,7 +118,7 @@

 		eye[i]=draweye(i*PI/NTAIL);

 	}

 	for(;;){

-		if(ecanmouse()) emouse();	/* don't get resize events without this! */

+		while(ecanmouse()) emouse();	/* don't get resize events without this! */

 		drawclock();

 		flushimage(display, 1);

 //		bflush();

--- a/sys/src/games/juggle.c

+++ b/sys/src/games/juggle.c

@@ -76,7 +76,7 @@

 void move(int t){

 	int i, j;

 	for(i=0;i!=NSTEP;i++){

-		if(ecanmouse()) emouse();

+		while(ecanmouse()) emouse();

 		draw(image, inset(image->r, 3), display->white, nil, ZP);

 		for(j=0;j!=nball;j++)

 			fillellipse(image, bpos(j, i, t), RBALL, RBALL, disk[j%ndisk], ZP);