[issue30694] Update embedded copy of expat to 2.2.1

[Ned Deily]

Ned Deily added the comment:


New changeset 05b72ede95521b2d897cb4c7b034139b5437c592 by Ned Deily in branch '3.6':
bpo-30797, bpo-30694: Avoid _GNU_SOURCE redefined warning in xmlparse.c (#2615)
https://github.com/python/cpython/commit/05b72ede95521b2d897cb4c7b034139b5437c592


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