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

[STINNER Victor]

STINNER Victor added the comment:

I produced attached PR 3315 using attached cpython_rebuild_expat_dir.sh + revert Modules/expat/expat_external.h change to keep #include "pyexpatns.h".

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<http://bugs.python.org/issue31170>
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