Use the same technique madpilot used on x11-toolkits/ocaml-lablgtk2
to restore the build after the (unexpected) changed to the output
of ocamlfindlib during its update to 1.7.1
This is a new requirement for the latest veersion of alt-ergo.
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The Zarith library implements arithmetic and logical operations over
arbitrary precision numbers. It uses GMP to efficiently implement
arithmetic over large numbers. Small integers are represented as Caml
unboxed integers for speed and space economy.
WWW: http://forge.ocamlcore.org/projects/zarith