ocaml - security update

OCaml versions 4.02.3 and earlier have a runtime bug that,
on 64-bit platforms, causes sizes arguments to an internal
memmove call to be sign-extended from 32 to 64-bits before
being passed to the memmove function.
This leads arguments between 2GiB and 4GiB to be interpreted
as larger than they are (specifically, a bit below 2^64),
causing a buffer overflow.
Arguments between 4GiB and 6GiB are interpreted as 4GiB smaller
than they should be, causing a possible information leak.A

For Debian 7 Wheezy, these issues have been fixed in ocaml version 3.12.1-4+deb7u1