[issue45440] [C API] Py_IS_INFINITY() macro doesn't work in the limited C API if isinf() is not defined

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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pull_requests: +27265
pull_request: https://github.com/python/cpython/pull/28977

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45440>
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