[issue37437] update vendorized expat to 2.2.7

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset ffa419ad004de96395a655f6b8d1a58b7c73372e by Miss Islington (bot) in branch '3.7':
bpo-37437: Pass -Wno-unreachable-code when compiling expat. (GH-14470)
https://github.com/python/cpython/commit/ffa419ad004de96395a655f6b8d1a58b7c73372e


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<https://bugs.python.org/issue37437>
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