fixed memory leaks in ForkLiftDemo/VehicleDemo

Thanks to mi076 for report+fix: http://bulletphysics.com/Bullet/phpBB3/viewtopic.php?f=9&t=2652
Minor syntax error fix in a Jamfile

Demos/ForkLiftDemo/ForkLiftDemo.h

@@ -69,6 +69,7 @@ class ForkLiftDemo : public GlutDemoApplication
 	btRaycastVehicle::btVehicleTuning	m_tuning;
 	btVehicleRaycaster*	m_vehicleRayCaster;
 	btRaycastVehicle*	m_vehicle;
+	btCollisionShape*	m_wheelShape;
 
 	float		m_cameraHeight;