update Changes for -no-naked-pointers

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14793 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Enable warning 27 in tools/ and fix occurrences.  It's good to mark in depend and untypeast parts which are explicitly ignored.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14794 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02