[libvirt] [PATCH] Fix sparse volume allocation reporting

[Cole Robinson]

I have a sparse volume with a capacity of 1000M, and an allocation of a
little over 750M. 'du' prints the correct sizes, but 'virsh vol-dumpxml'
shows:

    <capacity>1048576000</capacity>
  <allocation>6406307840</allocation>

This is because we were calculating the allocation size using the
requested fs block size, instead of what stat actually uses as a block
size (DEV_BSIZE in sys/params.h). sys/params.h looks to be present in
mingw32-runtime, so I didn't add a configure check for it.

The attached patch fixes allocation listing for me.

Thanks,
Cole
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