[3.11] gh-91321: Fix test_cppext for C++03 (GH-93902) #93904
Merged
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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 a38c2a6)
Co-authored-by: Victor Stinner vstinner@python.org