BLD: Lazy load f2py test utilities #17758
Merged
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These are only used during testing. It's fine to load it while running the test because actually running the test can't be done while cross compiling. I haven't tested this at all... but I expect CI will break if it doesn't work.
Part of changes to support #17620 to prevent importing numpy during builds to support cross-compilation
Replaces #17730 and #17732.