Pull up following revision(s) (requested by ryo in ticket #445):
distrib/sets/lists/debug/mi: revision 1.222
distrib/sets/lists/tests/mi: revision 1.760
share/man/man4/ip.4: revision 1.38
sys/netinet/in.c: revision 1.207
sys/netinet/in.h: revision 1.101
sys/netinet/in_pcb.c: revision 1.179
sys/netinet/in_pcb.h: revision 1.64
sys/netinet/ip_output.c: revision 1.284, 1.286
sys/netinet/ip_var.h: revision 1.120-1.121
sys/netinet/raw_ip.c: revision 1.166-1.167
sys/netinet/udp_usrreq.c: revision 1.235-1.236
sys/netinet/udp_var.h: revision 1.42
tests/net/net/Makefile: revision 1.21
tests/net/net/t_pktinfo_send.c: revision 1.1-1.2
Add support IP_PKTINFO for sendmsg(2).
The source address or output interface can be specified by adding IP_PKTINFO
to the control part of the message on a SOCK_DGRAM or SOCK_RAW socket.
Reviewed by ozaki-r@ and christos@. thanks.
--
As is the case with IPV6_PKTINFO, IP_PKTINFO can be sent without EADDRINUSE
even if the UDP address:port in use is specified.

(snj)