Log Message:
Import dhcpcd-10.2.2 with the following changes:

* Only drop IPv4 LL addresses if configured to handle them
* Fix building with different options (INET and INET6 only)
* BSD: Fix netmask family and length for incoming route msgs
* DHCP6: RENEW/REBIND if T1/T2 have passed at CONFIRM
* Add option to not use syslog