Log Message:
Import dhcpcd-6.10.3 with the following changes:
  *  Support iSNS, RFC4174
  *  Fix Prefix Delegation with SLA 0 and warn that it's not
     really RFC compliant
  *  Fix build with --disable-embedded
  *  On an IPv4LL defence, an ARP announcement is now sent in
     accordance with RFC 3927 Section 2.5

dhcpcd-6.10.2 had the following changes:
  *  Add fix for CVE-2014-7913.
  *  eloop performance and API improvements.
  *  Don't send a blank hostname.
  *  Prefix Delegation default value fixes.
  *  Prefix Delegation suffix is now configurable.
  *  dhcpcd.conf now allows embedded comments.
  *  IPv6 static address support.
  *  ipv6ra_accept_nopublic has been removed, all prefixes now accepted.
  *  Support RTF_CONNECTED on NetBSD.
  *  Fix compile on older platforms which lack O_CLOEXEC.
     Thanks to OBATA Akio.
  *  Remove pidfile handling from dhcpcd and use pidfile_lock(3).
     If not available, use a compat shim.
  *  Fix ignoring messages sent to the kernel and receive via another one
     on Linux.
  *  Fix changing routes on BSD.