LIST_FIRST(3) on FreeBSD

The text 86b7676c2649, as FreeBSD 4.3-RELEASE, FreeBSD 4.2-RELEASE, FreeBSD 4.1.1-RELEASE, FreeBSD 4.1-RELEASE shipped it.

implementations of singly-linked lists, singly-linked tail queues, lists, tail queues, and circular queues