* lib/prototypes.h, libmisc/addgrps.c: restrict add_groups() to

	* lib/prototypes.h, libmisc/addgrps.c: restrict add_groups() to
	ifndef USE_PAM.
	* lib/prototypes.h: Remove the declaration of add_cons_grps(). The
	function does not exist.
	* libmisc/age.c (setup_uid_gid): is_console is never set ifndef
	USE_PAM. Change the prototype of setup_uid_gid() when USE_PAM is
	not defined. This permits to remove add_groups from PAM builds.
	setup_uid_gid is already subject to HAVE_INITGROUPS.
	* libmisc/pwd2spwd.c (pwd_to_spwd): pwd_to_spwd() is not used in
	PAM builds.