Update net/dnscap to dnscap-141, from Benedek Gergely via pkgsrc-users@.

ok by wiz@.

Changes:
2012-03-22
        Added -Y option to specify the IP address of responses that
        should not be captured.  This option is useful when you want
        to capture queries and spoofed response (DDoS attack) traffic,
        but not the normal response traffic.

        Added -L option to specify that dnscap should capture both
        VLAN-tagged and un-tagged packets.  This is in contrast
        to the existing -l option which causes untagged packets
        to be ignored.

(leot)