security/wpa_supplicant-devel: Enable WEP by default

As of hostap 2.10, WEP is disabled by default. This of course is not a
bad thing but requires some planning and an announcment to remove WEP
support by default. At some point this option will default to off, to
coincide with the removal of WEP support from FreeBSD base.

(cherry picked from commit fb0e9b4ce90da94c2943639f3588d25c76778a31)