Log Message:
Update iperf to 2.0.2.

Fixes configuring of multicast support and ipv6 support on NetBSD.
Add patches to deal with:
  setsockopt(..., IP_MULTICAST_TTL,..) takes a u_char arg (not int).
  On NetBSD and Solaris (probably other BSD's) ipv6 multicast group
  join is done with IPV6_JOIN_GROUP not linux's IPV6_ADD_MEMERSHIP.