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

(roy)