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

Don't build _testcppext.cpp with -Wzero-as-null-pointer-constant when
testing C++03: only use this compiler flag with C++11.
V
Victor Stinner committed
a38c2a61d585fce0973e93dd590551ccddd947fb
Parent: 7546914
Committed by GitHub <noreply@github.com> on 6/16/2022, 12:39:00 PM