[issue31170] Update to expat 2.2.4 (expat: utf8_toUtf8 cannot properly handle exhausting buffer)

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at gmail.com>:


Added file: http://bugs.python.org/file47118/cpython_rebuild_expat_dir.sh

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31170>
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