by the TCP implementation for its reorder and retransmit queues.
* The ipv4_fragment is no longer needed, as we can use the above field there
as well - this saves one extra allocation per received fragment.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19369 a95241bf-73f2-0310-859d-f6bbb57e9c96