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

[Gregory P. Smith]

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

It is much less effort for us to simply take a new version of an external library and recompile rather than consider it part of our code that shouldn't change within a release and manually deal with patching it and cherry picking patches onto it.

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