demos: add some fflushes for windows
diff --git a/progs/demos/geartrain.c b/progs/demos/geartrain.c
index 8363f2a..8fe405e 100644
--- a/progs/demos/geartrain.c
+++ b/progs/demos/geartrain.c
@@ -905,6 +905,7 @@
 	    GLfloat seconds = (t - T0) / 1000.0;
 	    GLfloat fps = Frames / seconds;
 	    printf("%d frames in %g seconds = %g FPS\n", Frames, seconds, fps);
+            fflush(stdout);
 	    T0 = t;
 	    Frames = 0;
 	}