Added some notes about this implementation.

diff --git a/src/glut/directfb/NOTES b/src/glut/directfb/NOTES
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+DirectFB GLUT Implementation NOTES
+----------------------------------
+
+* To have high performance rendering, it's really important to
+  use glutEnterGameMode() instead of glutCreateWindow()/glutFullScreen().
+  You can also force a windowed application to game mode by setting
+  the environment variable "__GLUT_GAME_MODE".
+
+