(svn r2688) MSVC and Watcom can't handle identical file names in different directories, oh my...
#include "stdafx.h"
#include "openttd.h"
#include "sound/null_s.h"
static const char *NullSoundStart(const char * const *parm) { return NULL; }
static void NullSoundStop(void) {}
const HalSoundDriver _null_sound_driver = {
NullSoundStart,
NullSoundStop,
};