macos: avoid KLRenewInitialTickets crash in Lion

macos: avoid KLRenewInitialTickets crash in Lion

the shimmed heimdal in Lion crashes on this call now.
the shim also exports diddly squat. fine, we pick over what
IS exported and use only calls available to us.

should be exactly as functional as before.

Reviewed-on: http://gerrit.openafs.org/5065
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 62cccc4547bd816dfffb2c1a4431c3c674d302f8)

Change-Id: I44ec9305c3f8e07cb68b2614b237b62e29a66516
Reviewed-on: http://gerrit.openafs.org/5071
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>