Check for pcap_create

Check for pcap_create
Using pcap create and pcap_activate should make it possible
to set the capture buffer size on Linux systems as well as Windows.
Help to implement it would be apreciated :-)

Ref:
http://seclists.org/tcpdump/2009/q3/151

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@32687 f5534014-38df-0310-8fa8-9805f1628bb7