Remove local patch from expat on AT Next
Remove local patch from expat on AT Next

Commit ID cb7d430d22c0 on libexpat fixed the dependency check for
docbook, which renders obsolete the local patch on AT Next.  This commit
removes the local patch and updates libexpat.

Signed-off-by: Gabriel F. T. Gomes <18a98c35f49808b45edadc75fb1b25ebfd4037d6@inconstante.eti.br>

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