build-sys: do not check readme and news when automake runs

Change-Id: Idb5bb57efecf0a9776db78466787987ba7680533
Reviewed-on: http://gerrit.openafs.org/10007
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>