Log Message:
Import dhcpcd-8.0.2 with the following changes:

  *  NetBSD: Can be build without ARP support but listen to kernel DaD
  *  ND6: Removed NA support from SMALL builds
  *  ND6: Remove and warn about NA on OS's other than NetBSD and Linux
  *  script: tmp files are removed for systems without open_memstream(3)
  *  configure: open_memstream(3) detected on recent glibc
  *  DHCP: Avoid duplicate read of UDP socket when BPF is also open
  *  IP: Avoid adding address if already exists on OS other than Linux
  *  IP6: Avoid adding address is already exists on Solaris
  *  route: Fixed a NULL de-reference error on static routes
  *  DHCP6: Move to REQUEST if any IA has no-binding in REWNEW/REBIND
  *  DragonFlyBSD: Now compiles and works for
  *  IP: Accept packets with IP header options