libadmin: remove duplicate dependency

libadmin: remove duplicate dependency

afs_AdminPtsErrors.h was listed twice in the dependency
afs_utilAdmin.o dependency list.

Reviewed-on: http://gerrit.openafs.org/10725
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
(cherry picked from commit 9b105c5586a2e9c5c55dce7785e681f73ea0a759)

Change-Id: Ibf01dd6c67ecb6a89e30bd93eef82afae5eb84c4
Reviewed-on: http://gerrit.openafs.org/11232
Reviewed-by: Perry Ruiter <pruiter@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>