Fix 'jam -dc' output broken by 2614.
Now the parent's timestamp is propagated to the targets marked
T_FLAG_INTERNAL, so that -dc can see that a header file is newer
than the file that includes it.
Fix to unreleased bug.
=== computer:1666: Change 40499 by seiwald@play-seiwald on 2003/01/21 22:35:27