[Libguestfs] enable build for ocaml bytecode

[Richard W.M. Jones]

I believe this patch has now been superseded by Hilko's commit here:

https://github.com/libguestfs/libguestfs/commit/f75142c577255b30f2a8e1d27baa5fd185594197

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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Fedora now supports 80 OCaml packages (the OPEN alternative to F#)