r313695: MFV r313676: libpcap 1.8.1 r313760: MFV r313759: license change for a few headers (4 clause BSD to 3 clause BSD). X-MFC-with: r313695 r314769: Remove compatibility with old libpcap. Differential Revision: https://reviews.freebsd.org/D9606 r314863: Stop installing pcap-int.h, which is the internal interface for libpcap. Reference: https://github.com/the-tcpdump-group/libpcap/issues/560 PR: 217221 r314865: Bump __FreeBSD_version for removal of pcap-int.h. PR: 217221 r316125: MFV r316124: Fix build when WITHOUT_INET6. Reported by: Randy Westlund <rwestlun gmail com>