[issue11410] Use GCC visibility attrs in PyAPI_*

[Vinay Sajip]

Change by Vinay Sajip <vinay_sajip at yahoo.co.uk>:


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pull_requests: +15924
pull_request: https://github.com/python/cpython/pull/16347

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue11410>
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