inet6_option_append(3) on FreeBSD

The text 852763cd1d6e, as FreeBSD 7.0-RELEASE, FreeBSD 6.3-RELEASE, FreeBSD 6.2-RELEASE, FreeBSD 6.1-RELEASE, FreeBSD 6.0-RELEASE shipped it.

IPv6 Hop-by-Hop and Destination Option Manipulation