Remove unneeded inclusion of <sys/timeb.h>

Remove unneeded inclusion of <sys/timeb.h>

This file is deprecated on FreeBSD, and is not used anywhere.

Reviewed-on: http://gerrit.openafs.org/10817
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit add4b8100e9b9624b6e03fa7d471367720ab062e)

Change-Id: I06dfd8f90f2e8e4b2ca38692cbc4aa90dcdffe13
Reviewed-on: http://gerrit.openafs.org/11775
Reviewed-by: Jeffrey Altman <jaltman@auristor.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>