Update libpcap from version 1.6.2 to 1.7.4
LICENSE checksum has changed because of the removal of additional
spaces in the file.
(From OE-Core rev: 0256743e7ad6e430aa2380ce51c84b3ce5928a1f)
Signed-off-by: Maxin B. John <maxin.john@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>