Fix #6193 (Incorrect warning 12 for character ranges).

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14205 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Keep attributes with module type declarations. Warning on reference to deprecated module type.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14206 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02