In Wireshark and TShark, run dumpcap to get interface lists and lists of

In Wireshark and TShark, run dumpcap to get interface lists and lists of
link-layer header types for interfaces; if special privileges are
necessary to open capture devices, Wireshark and TShark shouldn't have
those privileges, but dumpcap should.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@32104 f5534014-38df-0310-8fa8-9805f1628bb7