Log Message:
Update to dhcpcd-8.1.5 with the following changes:

 * inet: Allow forcing a host route from an interface without a lease
 * dhcpcd: Don't wait for an address family to complete if not using it
 * Linux: fix RA time unit confusion

If you are suffering from IPv6 addresses not transitioning from the
tentative state (regression from dhcpcd-8.1 on Linux), you will need
to do one of the following after installing dhcpcd:

 * reboot

   OR

 * dhcpcd -x
 * echo 1000 > /proc/sys/net/ipv6/neigh/$interface/retrans_time_ms
 * ip -f inet6 a flush
 * start dhcpcd as normal