[3.11] gh-91321: Fix compatibility with C++ older than C++11 (#93784)#93802

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vstinner merged 1 commit intopython:3.11from vstinner:nullptr311

Jun 14, 2022

+156-88

Commits on Jun 14, 2022

gh-91321 : Fix compatibility with C++ older than C++11 (#93784 )
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