[3.12] gh-117692: Fix AttributeError in DocTestFinder on wrapped builtin_or_method (GH-117699)

[miss-islington]

(cherry picked from commit 4bb7d12)

Co-authored-by: Nikita Sobolev [email protected]
Co-authored-by: Alex Waygood [email protected]

• Issue: doctest fails to collect tests from a C function that has been wrapped #117692

[AlexWaygood]

Hmm, looks like the @doctest_skip_if decorator doesn't exist on Python 3.12

[AlexWaygood]

Hmm, looks like the @doctest_skip_if decorator doesn't exist on Python 3.12

@sobolevn, reckon we should just backport the doctest_skip_if decorator to 3.12 as part of this PR? It seems pretty simple and low-risk

[sobolevn]

See #116758 (comment)
I also thought that skipping this doctest would be easier, but the oirignal PR author had a valid point about doctest internals change in 3.13. We can go with if ...: in this branch.