[libvirt] libxl driver doesn't build with xen 4.2

Hi Jim, The libvirt libxl driver doesn't build with xen 4.2. There was a small thread about it on fedora's virt list: http://lists.fedoraproject.org/pipermail/virt/2012-October/003446.html I saw that you had a few xen 4.2 patches land recently, and I'm just curious if you were aware of the libxl issues/possibly had any patches brewing. Currently in fedora we've disabled building the libxl driver so the xen guys can pull in their latest bits. Thanks, Cole