[issue30694] Update embedded copy of expat to 2.2.1

[STINNER Victor]

STINNER Victor added the comment:


New changeset 2ada64d2a073f85f135461833952dbe8d656810d by Victor Stinner in branch '2.7':
[2.7] bpo-30694: Upgrade Modules/expat/ to libexpat 2.2.1 (#2300) (#2312)
https://github.com/python/cpython/commit/2ada64d2a073f85f135461833952dbe8d656810d


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