ports/64777: Update port: net/ethereal to 0.10.3 and SNMP correction (fwd)

[Jacques A. Vidrine]

Thanks.   Hopefully this update really does address all of:

CAN-2004-0176 - 13 overflows in various dissectors
CAN-2004-0365 - RADIUS null dereference in dissect_attribute_value_pairs()
CAN-2004-0367 - zero-length Presentation protocol selector

Cheers,
-- 
Jacques Vidrine / nectar at celabo.org / jvidrine at verio.net / nectar at freebsd.org