(svn r6054) Change the sign sorter in a similar way as the other sorters: Remember a list of pointers to signs instead of a list of SignIDs - This removes a layer of indirection
Also make the sign list static

/* $Id$ */

#ifndef SOUND_NULL_H
#define SOUND_NULL_H

#include "../hal.h"

extern const HalSoundDriver _null_sound_driver;

#endif