Autoconf : Kill dead code

Autoconf : Kill dead code

Remove unused autoconf macros - they're not being called, and so
have bitrotted, and are just cluttering up the tree.

Change-Id: Ib2d1fc5121b6845cf0b500e5aef8ca822be58ad3
Reviewed-on: http://gerrit.openafs.org/1971
Reviewed-by: Russ Allbery <rra@stanford.edu>
Tested-by: Russ Allbery <rra@stanford.edu>