For some reason I had removed wext-compat, add it back

For some reason I had removed wext-compat, add it back

cfg80211-$(CONFIG_WIRELESS_EXT) += wext-compat.o wext-sme.o

we depend on your kernel's CONFIG_WIRELESS_EXT for this.

This should fix what users report as:

00:32 < Sticky__>  hmm, now getting errors on "modprobe ath5k": "WARNING: Error inserting ath
(/lib/modules/2.6.28-13-generic/updates/drivers/net/wireless/ath/ath.ko): Unknown symbol in module, or
unknown parameter (see dmesg)"
00:32 < Sticky__> and from dmesg: [ 2245.275139] cfg80211: Unknown symbol cfg80211_wext_freq

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>