neon has changed incompatibly since the last release of cadaver so it
won't compile against our installed version of neon. The included
version of neon doesn't appear to like the installed version of expat,
so use the included version of that too. The load order of libraries
needed changing to ensure that the included version of neon is used.
These changes should be reverted if/when a newer release of cadaver
catches up with the neon API.
