aklog: attempt to warn about needed weak crypto switch for Lion

aklog: attempt to warn about needed weak crypto switch for Lion

Lion's Kerberos is rather unfortunate. deal with the multitude of
missing functionalities by hardcoding this case here.

Reviewed-on: http://gerrit.openafs.org/5240
Tested-by: Derrick Brashear <shadow@dementix.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit 145a8490c761a0ebf7b3a1cc3017bbe8635f8014)

Change-Id: I0efe2ee18e36f0531de8261e5f032df7de3d7333
Reviewed-on: http://gerrit.openafs.org/5252
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>