Log Message:
Update OpenPAM to openpam-20130907 (Nummularia), including a fix for
CVE-2014-3879:

- Better dynamic loader, supports specifying modules without ".so"
  prefix.
- Improve documentation.
- openpam_subst, openpam_readword and openpam_readlinev helpers
- PAM_HOST item for better password prompts
- user_prompt, authtok_prompt and oldauthtok_prompt module options
- pamtest(1) program for testing policies and modules