shlibafsrpc: More exports to support perl-AFS 2.6.3

Add some additional exports for perl-AFS 2.6.3

This patch isn't applicable on master, as our whole shared library
infrastructure there has changed.

Change-Id: Ie1f399c9fcb1638501533a45ff9a17f95bc98afc
Reviewed-on: http://gerrit.openafs.org/8810
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Tested-by: Stephan Wiesand <stephan.wiesand@desy.de>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Paul Smeddle <paul.smeddle@gmail.com>