Add dhcpcd-6.4.3, a fully featured yet light weight
DHCPv4/IPv4LL/IPv6RS/DHCPv6 quad stack client.

Signed-off-by: Roy Marples <roy@marples.name>
Merge pull request #155 from rsmarples/master

Add dhcpcd-6.4.3, a DHCPv4/IPv4LL/IPv6RS/DHCPv6 quad stack client.