auth: Fix library dependencies so that tests build again

Change-Id: Ia95a94a77290baea419beb942ea60cd1b89c22fa
Reviewed-on: http://gerrit.openafs.org/11311
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>