* Moved ip6.h header from FreeBSD private to posix/netinet. * Added some more IPv6 support definitions to in.h, and in6.h. * Added icmp6.h header. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37599 a95241bf-73f2-0310-859d-f6bbb57e9c96