* Makefile.am [PAM_COND_UMOTD] (UMOTD_DIR): New variable.
(SUBDIRS): Add $(UMOTD_DIR).
* configure.ac: Check for security/pam_ext.h.
Add pam_umotd module.
* lib/graypam.h (pam_opt_type)<pam_opt_rest>: New type.
* lib/parseopt.c (gray_parseopt): Upon encoutnering pam_opt_rest parameter,
stop further processing and return the index of the next argument.
* pam_umotd/Makefile.am: New file.
* pam_umotd/pam_umotd.c: New file.