[issue30947] Update embeded copy of libexpat from 2.2.1 to 2.2.3

[STINNER Victor]

STINNER Victor added the comment:

cpython_rebuild_expat_dir.sh: Script used to update Modules/expat/ to 2.2.3. The script now uses the libexpat Git repository. Previously, I used tarballs.

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Added file: http://bugs.python.org/file47088/cpython_rebuild_expat_dir.sh

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