[issue30694] Update embedded copy of expat to 2.2.1

[Ned Deily]

Ned Deily added the comment:


New changeset ab90986600ba7dea2aa41e5c1773791070725453 by Ned Deily (Victor Stinner) in branch '3.3':
[3.3] bpo-29591, bpo-30694: Upgrade Modules/expat to libexpat 2.2.1 (#2164) (#2204)
https://github.com/python/cpython/commit/ab90986600ba7dea2aa41e5c1773791070725453


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<http://bugs.python.org/issue30694>
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