do not ship uncompressed tarballs

There's not much point to shipping uncompressed tarballs in 2013. Delete
them during "make-release".

Reviewed-on: http://gerrit.openafs.org/10116
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Ken Dreyer <ktdreyer@ktdreyer.com>
(cherry picked from commit 0346ed6f53a6f3fb5d75de41c7ec5a139727618f)

Change-Id: Ic1247c6a42ecb6a5c6bae1fd88b789a8b3e55d49
Reviewed-on: http://gerrit.openafs.org/10131
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>