Log Message:
Update lang/camlp5 to 5.13

The update lets camlp5 and what depends on it work with the updated ocaml.

Changes:
* Added compatibility with OCaml 3.11.2.
* Updated compatibility with OCaml 3.12.0.
* Added 'lazy' patterns (added in OCaml version 3.11).
* Fixed bug in pr_r.cmo: did not always break after "in" (in
  "let..in" statements) even with -flag l.
* Fixed bug in pr_r.cmo: missing case "#use" for structure and
  signature items.