ocaml: New plugin lets you write plugins as natively compiled OCaml programs.

This requires your OCaml compiler to support native compilation and be
compiled with -fPIC (ie. it won't work with most distro builds of
OCaml).  I have filed a bug upstream to add support for building
shared libraries from OCaml:

http://caml.inria.fr/mantis/view.php?id=6693