This is enough to be able to invoke the ifconfig command but it
calls exit() which is inappropriate.
The "struct option" in the ifconfig code conflicts with a structure
of the same name in newlib's and glibc's getopt.h.
The old network configuration using a data structure does not
support IPV6 and does not support all of the network settings
that the FreeBSD command line utilities do. Transition to using
the network utilities like ifconfig, route, etc. to initialize
the NIC configuration.
