(svn r4572) Remove vehicle_leave_tile_proc
There's exactly one implemented function (unbarring a level crossing) and one place where it can be triggered (a train leaves a level crossing)
It's a bit overkill, so just handle this one case where it can happen

/* $Id$ */

#ifndef SOUND_COCOA_H
#define SOUND_COCOA_H

#include "../hal.h"

extern const HalSoundDriver _cocoa_sound_driver;

#endif