Update security/PAM to 0.77. Changes from version 0.75 include:

* Numerous bug fixes for most of the PAM modules, including several
  string length checks and fixes (update recommended!).

* fix for legacy behavior of pam_setcred and pam_close_session in
  the case that pam_authenticate and pam_open_session hadn't been
  called

* pam_unix:
	- don't zero out password strings during password changing function
* pam_wheel:
	- feature: can use the module to provide wheel access to non-root
	  accounts.
* pam_limits:
	- added '%' domain for maxlogins limiting, now '*' and @group
	  have the old meaning (every) and '%' the new one (all)
	- handle negative priority limits (which can apply to the
	  superuser too).
* pam_userdb:
	- require that all of typed password matches that in database
* pam_access:
	- added the 'fieldsep=' argument, made a PAM_RHOST of ""
	  equivalent to NULL

Incidentally, cups-1.1.18 will once again do PAM authentication using
pam_unix.so if built against PAM-0.77.

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