SACT: Add WaitVsync() in animation loops

So that sprite updates are reflected on the screen.

modules/SACT/sprite_move.c

@@ -164,6 +164,7 @@ void spev_move_waitend(sprite_t *sp, int dx, int dy, int time) {
 	
 	while (sp->move.moving) {
 		nact->callback();
+		WaitVsync();
 	}
 }
 
@@ -182,6 +183,7 @@ void spev_wait4moving_sp() {
 		
 		while (sp->move.moving) {
 			nact->callback();
+			WaitVsync();
 		}
 	}
 }