RedHat: don't package manpages for binaries not included

We don't package copyauth, aklog_dynamic_auth and rmtsysd.
Omit their manpages too.

Change-Id: I653e24be9ac258bcb1539bc773eebae728d6261b
Reviewed-on: http://gerrit.openafs.org/10781
Reviewed-by: Ken Dreyer <ktdreyer@ktdreyer.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: D Brashear <shadow@your-file-system.com>