xfs/122: disable this test for any codebase that knows about metadir

xfs/122: disable this test for any codebase that knows about metadir

All of the ondisk structure size checks from this test were copied to
the build time checks in xfs_ondisk.h.  This means that the kernel and
xfsprogs build processes check the structure sizes, which means that
fstests no longer needs to do that.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Zorro Lang <zlang@kernel.org>