wpa_supplicant does not build

["Nicolas Thery" <nthery@xxxxxxxxx>]

Hello,

I've just updated my source tree to HEAD and tried to buildworld.  It fails
while building usr.sbin/802_11/wpa_supplicant:

make: don't know how to make config.c stop.

There is indeed no config.c in this directory though the original
package (http://hostap.epitest.fi/wpa_supplicant/) has one.

Cheers,
Nicolas