ocaml-libvirt: Update changelog
ocaml-libvirt: Update changelog

Our version of the specfile is quite a bit behind the upstream
version from Fedora 18, and is now also beginning to diverge.
We should consider switching to the upstream package.

Signed-off-by: Euan Harris <c3b6e83069c8e9e3af49a38fec6026be89559638@citrix.com>

djs55/planex,simonjbeaumont/planex,simonjbeaumont/planex,djs55/planex,simonjbeaumont/planex,djs55/planex