To maintain the status quo, we need to pull in backzone file. This file
can't be built on its own, so the easiest fix is to give zic(1) all the
files at once.
We also now have a situation where we have links to links, so we need to
dereference them until we find actual data.
Bug: 18330681
(cherry picked from commit 2c2463bd3065f0a5fef34a47e3eb94aad64b0cea)
Change-Id: I654b80518a7144038d8b3ea7223f49e2b1d2ad13
371dcc189f