progs: add fflushes for cygwin
diff --git a/progs/demos/dinoshade.c b/progs/demos/dinoshade.c
index 451da2e..41b19d5 100644
--- a/progs/demos/dinoshade.c
+++ b/progs/demos/dinoshade.c
@@ -624,6 +624,7 @@
     glFinish();
     end = glutGet(GLUT_ELAPSED_TIME);
     printf("Speed %.3g frames/sec (%d ms)\n", 1000.0/(end-start), end-start);
+    fflush(stdout);
   }
 
   glutSwapBuffers();
@@ -878,6 +879,7 @@
       polygonOffsetVersion = MISSING;
       printf("\ndinoshine: Missing polygon offset.\n");
       printf("           Expect shadow depth aliasing artifacts.\n\n");
+      fflush(stdout);
     }
   }
 
diff --git a/progs/redbook/polyoff.c b/progs/redbook/polyoff.c
index 2017b4d..de34b2e 100644
--- a/progs/redbook/polyoff.c
+++ b/progs/redbook/polyoff.c
@@ -153,6 +153,7 @@
    double seconds, fps;
 
    printf("Benchmarking...\n");
+   fflush(stdout);
 
    draws = 0;
    startTime = glutGet(GLUT_ELAPSED_TIME);
@@ -169,6 +170,7 @@
    seconds = (double) (endTime - startTime) / 1000.0;
    fps = draws / seconds;
    printf("Result:  fps: %g\n", fps);
+   fflush(stdout);
 }
 
 
@@ -263,6 +265,7 @@
       default:
          break;
    }
+   fflush(stdout);
 }
 
 static void