I've also added insque(3) and remque(3) (from NetBSD because the OpenBSD
ones are currently broken for non-circular lists).
I've not added the three hash table functions that should be in this header
because they operate on a single global hash table and thus aren't likely
to be useful.
Bug: https://code.google.com/p/android/issues/detail?id=73719
(cherry picked from commit 3e424d0a24)
Change-Id: I5882a6b48c80fea8ac6b9c27e7b9de10b202b4ff
