[issue41486] Add _BlocksOutputBuffer for bz2/lzma/zlib module

[Ma Lin]

Change by Ma Lin <malincns at 163.com>:


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keywords: +patch
pull_requests: +20886
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/21740

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41486>
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