[issue14340] Update embedded copy of expat - fix security & crash issues

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> What would be awesome is if we could just kill embedded versions of libraries like expat.

It practically wouldn't change much, since we still bundle them as part
of Windows binaries.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14340>
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