mac80211: don't claim iwspy support

We removed iwspy support a very long time ago because it is useless, but
forgot to stop claiming to support it. Apparently, nobody cares, but
remove it nonetheless.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/wext.c

@@ -209,7 +209,6 @@ static int ieee80211_ioctl_giwrange(struct net_device *dev,
 	range->num_frequency = c;
 
 	IW_EVENT_CAPA_SET_KERNEL(range->event_capa);
-	IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWTHRSPY);
 	IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWAP);
 	IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWSCAN);