[libvirt] [PATCH] support XEN_SYSCTL_INTERFACE_VERSION

[Jim Fehlig]

xen-unstable c/s 20762 bumped XEN_SYSCTL_INTERFACE_VERSION to 7.  I
don't see how the interface change affects libvirt, other than failing
xenHypervisorInit() since version 7 is not tried.

The attached patch accommodates the upcoming Xen 4.0 release by checking
for XEN_SYSCTL_INTERFACE_VERSION 7.  If found, it sets
XEN_DOMCTL_INTERFACE_VERSION to 6, which is also new to Xen 4.0.

Regards,
Jim
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