Import NetBSD dhcpcd(8)

The port could be improved by adding support for pselect(2).

Other than that, this port has a few MINIX-specific changes:

- we undefine IN_IFF_ flags to stop dhcpcd from th

Import NetBSD dhcpcd(8)

The port could be improved by adding support for pselect(2).

Other than that, this port has a few MINIX-specific changes:

- we undefine IN_IFF_ flags to stop dhcpcd from thinking that we have
operating system support for link-local IPv4 address management;
- we work around one crash bug that seems triggered by using dhcpcd
on some but not all interfaces;
- we add "noalias" to the default dhcpcd.conf(5) configuration file.

Change-Id: I8a81c2c2af353c5ce08335673b1ab2d4b39178da

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