libpcap: Update to 1.8.1

  Change log:

Tuesday, Oct. 25, 2016 mcr@sandelman.ca
  Summary for 1.8.1 libpcap release
    Add a target in Makefile.in for Exuberant Ctags use: 'extags'.
    Rename configure.in to configure.ac: autoconf 2.59
    Clean up the name-to-DLT mapping  table.
    Add some newer DLT_ values: IPMI_HPM_2,ZWAVE_R1_R2,ZWAVE_R3,WATTSTOPPER_DLM,ISO_14443,RDS
    Clarify what the return values are for both success and failure.
    Many changes to build on windows
    Check for the "break the loop" condition in the inner loop for TPACKET_V3.
    Fix handling of packet count in the TPACKET_V3 inner loop: GitHub issue #493.
    Filter out duplicate looped back CAN frames.
    Fix the handling of loopback filters for IPv6 packets.
    Add a link-layer header type for RDS (IEC 62106) groups.
    Use different intermediate folders for x86 and x64 builds on Windows.
    On Linux, handle all CAN captures with pcap-linux.c, in cooked mode.
    Removes the need for the "host-endian" link-layer header type.
    Compile with '-Wused-but-marked-unused' in devel mode if supported
    Have separate DLTs for big-endian and host-endian SocketCAN headers.
    Reflect version.h being renamed to pcap_version.h.
    Require that version.h be generated: all build procedures we support generate version.h (autoconf, CMake, MSVC)!
    Properly check for sock_recv() errors.
    Re-impose some of Winsock's limitations on sock_recv().
    Replace sprintf() with pcap_snprintf().
    Fix signature of pcap_stats_ex_remote().
    Initial cmake support for remote packet capture.
    Have rpcap_remoteact_getsock() return a SOCKET and supply an "is active" flag.
    Clean up {DAG, Septel, Myricom SNF}-only builds.
    Do UTF-16-to-ASCII conversion into the right place.
    pcap_create_interface() needs the interface name on Linux.
    Clean up hardware time stamp support: the "any" device does not support any time stamp types.
    Add support for capturing on FreeBSD usbusN interfaces.
    Add a LINKTYPE/DLT_ value for FreeBSD USB.
    Go back to using PCAP_API on Windows.
    CMake support
    Add TurboCap support from WinPcap.
    Recognize 802.1ad nested VLAN tag in vlan filter.

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
---
 config/rootfiles/common/libpcap | 5 ++++-
 lfs/libpcap                     | 6 +++---
 2 files changed, 7 insertions(+), 4 deletions(-)