fad-null: rename pcap_findalldevs() to pcap_findalldevs_interfaces()

This file is used on Debian GNU/Hurd where libpcap is expected to build,
even though it doesn't have the ability to do live captures.
Merge git://github.com/the-tcpdump-group/libpcap

Merge in changes from the GitHub repository.
Some changes didn't make it into 1.4.0.

Fix the CHANGES list by moving some changes that got in after the 1.4.0
release was made into a list for 1.4.1, and add some additional fixes to
that list.
added DLT type for wireshark save
Add support for Linux Kernel Messages

This feature use /dev/kmsg for capturing Linux kernel messages.