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gh-91321: Fix test_cppext for C++03 (GH-93902) (#93904)

Don't build _testcppext.cpp with -Wzero-as-null-pointer-constant when
testing C++03: only use this compiler flag with C++11.
(cherry picked from commit a38c2a61d585fce0973e93dd590551ccddd947fb)

Co-authored-by: Victor Stinner <vstinner@python.org>

Co-authored-by: Victor Stinner <vstinner@python.org>
M
Miss Islington (bot) committed
62f72e481183c89f94aa3d8e30c6d453db490561
Parent: df091e1
Committed by GitHub <noreply@github.com> on 6/16/2022, 1:17:35 PM