Export ubik_PR_ symbols from libafsauthent

Export ubik_PR_ symbols from libafsauthent

Also export from liboafs_prot the ones missing from this set.

This brings the unix exports in sync with the Windows exports
(of ubik_PR_ symbols), and is tested as being sufficient to compile
python-afs.

Reviewed-on: https://gerrit.openafs.org/13056
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Tested-by: Anders Kaseorg <andersk@mit.edu>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit 3be1de0e823db7068e27b9c5c30a91673f058e52)

Change-Id: I2cd44eb5686b1b7134eb0e4480f5f3502e865ce8
Reviewed-on: https://gerrit.openafs.org/13143
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>