progs/trivial: add fflushes for cygwin
diff --git a/progs/trivial/tri-fp.c b/progs/trivial/tri-fp.c
index b30f9b7..4d15081 100644
--- a/progs/trivial/tri-fp.c
+++ b/progs/trivial/tri-fp.c
@@ -49,6 +49,7 @@
    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
+   fflush(stderr);
 
    /* Setup the fragment program */
    glGenProgramsARB(1, &prognum);