[PATCH] Replace incorrect macro name "WIRELESS_EXT" with "CONFIG_WIRELESS_EXT"

Rename the (apparently) incorrect macro name WIRELESS_EXT to
CONFIG_WIRELESS_EXT.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>