Leave game mode on "deinitialization" if we entered it, per e-mail from John Tsiombikas dated 12/19/11 at 7:07 AM

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@960 7f0cb862-5218-0410-a997-914c9d46530a

freeglut/freeglut/src/freeglut_init.c

@@ -413,6 +413,11 @@ void fgDeinitialize( void )
         return;
     }
 
+	/* If we're in game mode, we want to leave game mode */
+    if( fgStructure.GameModeWindow ) {
+        glutLeaveGameMode();
+    }
+
     /* If there was a menu created, destroy the rendering context */
     if( fgStructure.MenuContext )
     {