When capturing, we only support writing to libpcap files. Given that,

When capturing, we only support writing to libpcap files.  Given that,
bypass Wiretap; that means we don't have to run the packet through
wtap_process_pcap_packet() and then undo that conversion in Wiretap if
we're just going to write it out, shortening the code path.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@17461 f5534014-38df-0310-8fa8-9805f1628bb7