apps/examples/fb:  Add a small delay between updating each rectangular region.
#include <sys/ioctl.h>
#include <sys/mman.h>
-#include <stdio.h>
+#include <unistd.h>
#include <stdlib.h>
+#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
@@ -419,6 +420,7 @@ int fb_main(int argc, char *argv[])
color, rect.pt1.x, rect.pt1.y, rect.pt2.x, rect.pt2.y);
draw_rect(&state, &rect, color);
+ usleep(500*1000);
width -= (2 * xstep);
height -= (2 * ystep);
