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Include the new ntfsfix API in RHEL 6.3.

This may allow sysprepped Windows guests to be resized,
although we have not fully proven that yet.  The API and
the patch is simple and uncontroversial

For the full context on this see:

https://bugzilla.redhat.com/show_bug.cgi?id=797760

The patch:

https://www.redhat.com/archives/libguestfs/2012-February/msg00109.html

NOTE that ntfsfix in RHEL 6 (libguestfs-winsupport) does
not have the -b (clearbadsectors) flag so the patch may need
to be modified slightly.