xfs/122: don't break on old xfsprogs

xfs/122: don't break on old xfsprogs

If we're running against a old version of xfsprogs that lacks some
of the structures that the golden output knows about, copy the
structure size definition from the golden output to the program
output.  This way we can check for structure size mutations on old
xfsprogs without generating false error reports for structs that
don't exist in the old release.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eryu Guan <eguan@redhat.com>