macos 10.6 updates

macos 10.6 updates

cope with mixed 32/64 environment provided by macos 10.6. build needed
stuff for audit logs in shlibafsauthent.

Reviewed-on: http://gerrit.openafs.org/310
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 3a48ae3e243b695ac5bb3b35aa3b09641db1af3b)
Reviewed-on: http://gerrit.openafs.org/360