[issue38687] Expose 'adler32_combine' function from zlib

[Callum Attryde]

Change by Callum Attryde <callumattryde at gmail.com>:


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keywords: +patch
pull_requests: +16561
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/17048

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38687>
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