[3.12] gh-129838: Don't redefine _Py_NO_SANITIZE_UNDEFINED (GH-129839) #130365
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Newer GCC versions accept both attribute((no_sanitize("undefined")))
and attribute((no_sanitize_undefined)) so check that the macro is
not already defined.
(cherry picked from commit 568db40)
Co-authored-by: Collin Funk collin.funk1@gmail.com