[libvirt] Problem compiling latest code from libvirt CVS

[Dave Allan]

Daniel P. Berrange wrote:
<snip>
> which is failing because neither of the node device driver implementations
> are turned on.
> 
> This is a bug in the storage_backend.c file. This is a generic shared file
> and as such, it should not have any  dependancy on the node device driver 
> code, since the latter is guarenteed to be available.

I'd split out this code to avoid duplication, but I'll refactor it again 
to avoid the dependency on the node device code & submit a patch.

Dave