[ALSA] Remove unreferenced header file include/sound/wavefront_fx.h

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

include/sound/wavefront_fx.h

-#ifndef __SOUND_WAVEFRONT_FX_H
-#define __SOUND_WAVEFRONT_FX_H
-
-extern int  snd_wavefront_fx_detect (snd_wavefront_t *);
-extern void snd_wavefront_fx_ioctl  (snd_synth_t *sdev, 
-				     unsigned int cmd, 
-				     unsigned long arg);
-
-#endif  __SOUND_WAVEFRONT_FX_H