demos: add some fflushes for windows
diff --git a/progs/demos/gears.c b/progs/demos/gears.c
index 2a9fefe..6016162 100644
--- a/progs/demos/gears.c
+++ b/progs/demos/gears.c
@@ -219,6 +219,7 @@
       GLfloat seconds = (t - T0) / 1000.0;
       GLfloat fps = Frames / seconds;
       printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps);
+      fflush(stdout);
       T0 = t;
       Frames = 0;
       if ((t >= 999.0 * autoexit) && (autoexit)) {