* pty_paranoia.c: New file; do many paranoid checks about ctty

	* pty_paranoia.c: New file; do many paranoid checks about ctty
	handling by the pty drivers.

	* Makefile.in: Add rules for pty_paranoia and check-paranoia,
	which runs pty_paranoia.

	* configure.in: Define REVOKE_NEEDS_OPEN for Tru64.  Add support
	for program building and run flags for the sake of pty_paranoia.

	* open_slave.c: Fix somewhat; AIX doesn't like opening the ctty
	twice, so only do initial open if we special-case it in
	configure.in, e.g. for Tru64.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@13239 dc483132-0cff-0310-8789-dd5450dbe970