libpcap: upgrade to 1.6.1

libpcap: upgrade to 1.6.1

- Still BSD licensed, some changes into
pcap triggered a checksum change;
- ieee80215-arphrd.patch removed, obsolete.
- switched to ${BP} variable;

Changelog from previous version:
Saturday  Jul. 19, 2014 mcr@sandelman.ca
  Summary for 1.6.1 libpcap release
	some fixes for the any device
	changes for how --enable-XXX works

Wednesday Jul. 2, 2014 mcr@sandelman.ca
  Summary for 1.6.0 libpcap release
        Don't support D-Bus sniffing on OS X
        fixes for byte order issues with NFLOG captures
        Handle using cooked mode for DLT_NETLINK in activate_new().
        on platforms where you can not capture on down interfaces, do not list them
        but: do list interfaces which are down, if you can capture on them!

(From OE-Core rev: ff962963de4dea9143f11ded480d0cca79a66d99)

Signed-off-by: Cristian Iorga <cristian.iorga@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>