tor/changes/bsd_queue

  o Code simplification and refactoring:
    - Start using OpenBSD's implementation of queue.h, so that we don't
      need to hand-roll our own pointer and list structures whenever we
      need them. (We can't rely on a sys/queue.h, since some operating
      systems don't have them, and the ones that do have them don't all
      present the same extensions.)
Add a copy of OpenBSD's sys/queue.h as tor_queue.h There are as many divergent implementations of sys/queue.h as there are operating systems shipping it, it would seem. They have some code in common, but have drifted apart, and have added other stuff named differently. So I'm taking a relatively sane one, and hoping for the best. I'm taking OpenBSD's in particular because of the lack of external dependencies, the presence of a CIRCLEQ (we could use one of those in places), and the liberal licensing terms. I'm naming the file tor_queue.h, since historically we've run into trouble having headers with the same names as system headers (log.h, for example.) 2012-10-12 23:05:06 +02:00			`o Code simplification and refactoring:`
			`- Start using OpenBSD's implementation of queue.h, so that we don't`
			`need to hand-roll our own pointer and list structures whenever we`
			`need them. (We can't rely on a sys/queue.h, since some operating`
			`systems don't have them, and the ones that do have them don't all`
			`present the same extensions.)`