airo: remove duplicated include from airo.c

From: Wei Yongjun <yongjun_wei@trendmicro.com.cn>

Remove duplicated include.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/airo.c

@@ -87,7 +87,6 @@ static struct pci_driver airo_driver = {
 /* Include Wireless Extension definition and check version - Jean II */
 #include <linux/wireless.h>
 #define WIRELESS_SPY		/* enable iwspy support */
-#include <net/iw_handler.h>	/* New driver API */
 
 #define CISCO_EXT		/* enable Cisco extensions */
 #ifdef CISCO_EXT