pam_securetty:
	Allows root logins only if the user is logging in on a
	"secure" tty, as defined by the listing in /etc/securetty

	Also checks to make sure that /etc/securetty is a plain
	file and not world writable.

	- Elliot Lee <sopwith@redhat.com>, Red Hat Software.
		July 25, 1996.
