* autoload.cc (GetIpForwardTable): Define.

	* autoload.cc (GetIpForwardTable): Define.
	* fhandler_socket.cc (fhandler_socket::ioctl): Handle SIOCGIFDSTADDR.
	* net.cc (get_routedst): New static function to get destination
	address of point-to-point interfaces.
	(get_xp_ifconf): Handle SIOCGIFDSTADDR.
	(get_2k_ifconf): Ditto.
	(get_nt_ifconf): Ditto.
	(get_ifconf): Ditto.
	* include/asm/socket.h (SIOCGIFDSTADDR): Define.
	* include/cygwin/if.h (struct ifreq): Add ifru_dstaddr member.
	(ifr_dstaddr): Define.
	* include/cygwin/in.h: Cast ipv4 addresses correctly to in_addr_t in
	definitions.