Exposed another glut method (the demos really require cleanup soon!)

First steps for a raycast-vehicle demo (far from finished)

Demos/ConstraintDemo/ConstraintDemo.cpp

@@ -381,6 +381,12 @@ void clientResetScene()
 	}
 }
 
+void clientSpecialKeyboard(int key, int x, int y)
+{
+	defaultSpecialKeyboard(key,x,y);
+}
+
+
 void clientKeyboard(unsigned char key, int x, int y)
 {
 	defaultKeyboard(key, x, y);