Auto merge of #1188 - pusateri:netbsd8, r=gnzlbg

NetBSD 8 adds new address family changing AF_MAX and new ifaddrs flags.

libc-test on NetBSD 8.0  fails without these changes.
ifa_addrflags was added to struct ifaddrs to support AF_CAN.
AF_MAX got bumped up one by AF_CAN.
RT_IFLIST format changed to support ifa_addrflags.