support for module versioning. OpenPAM will prefer a PAM module with
the same version number as the library itself to one with no version
number at all.
Sponsored by: DARPA, NAI Labs
git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@87 185d5e19-27fe-0310-9dcf-9bff6b9f3609