demos: add some fflushes for windows
diff --git a/progs/demos/fslight.c b/progs/demos/fslight.c
index e79b5cc..41a13cc 100644
--- a/progs/demos/fslight.c
+++ b/progs/demos/fslight.c
@@ -105,6 +105,7 @@
          GLfloat fps = frames / seconds;
          printf("%d frames in %6.3f seconds = %6.3f FPS\n",
                 frames, seconds, fps);
+         fflush(stdout);
          t0 = t;
          frames = 0;
       }