mwifiex: add wext include

In trying to remove the wext includes from mac80211
and cfg80211 I found that mwifiex currently uses
them. This is wrong, it shouldn't, but to not break
it completely include wext there.

Please remove this and fix all the resulting bugs.

Cc: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/ioctl.h

@@ -20,6 +20,7 @@
 #ifndef _MWIFIEX_IOCTL_H_
 #define _MWIFIEX_IOCTL_H_
 
+#include <linux/wireless.h>
 #include <net/mac80211.h>
 
 enum {