build: try “python3” as a last resort for 3.x
So that Xcode's Python 3 gets picked up.
Checklist
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make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
So that Xcode's Python 3 gets picked up.
make -j4 test (UNIX), or vcbuild test (Windows) passes