rem: void usage()
add: void usage(void)
context: void usage(){	fprintf(stderr, "OpenBeOS Network Team: ifconfig: version %s\n", version);	fprintf(stderr, "usage: ifconfig [ -m ] [ -a ] [ -A ] [ interface ]\n"		"\t[ [af] [ address [ dest_addr ] ] [ up ] [ down ] "		"[ netmask mask ] ]\n"		"\t[ metric n ]\n"		"\t[ mtu n ]\n"		"       ifconfig [-a | -A | -am | -Am] [ af ]\n"		"       ifconfig -m interface [af]\n");	exit(1);}