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

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

Indeed!  How do we do that on windows and osx where these may not exist outside of Python?

We already require a set of external dependency libraries on windows, could we just add expat to the list?

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<http://bugs.python.org/issue14340>
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