[issue37085] Expose additional socket constants for CAN_BCM flags

[Karl Ding]

Change by Karl Ding <karl.jw.ding at gmail.com>:


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keywords: +patch
pull_requests: +13541
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/13646

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37085>
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