gh-144712: Export _Py_jit_entry symbol via PyAPI_DATA

[ashm-dev]

• Issue: Duplicate symbol _Py_jit_entry when built with --enable-exterimental-jit #144712

[Fidget-Spinner]

Thanks for doing this @jjhelmus does this fix your problems?

[Fidget-Spinner]

@diegorusso does this look right to you?

[diegorusso]

Please hold on that. This #146071 needs to go in first and likely this needs to be adapted.

[ashm-dev]

@diegorusso#146071 was merged on 2026-05-02. I've rebased onto current main and adapted the initializer (_PyJIT → _PyJIT_Entry). Could you take another look? @Fidget-Spinner the change is small enough that your earlier approval should still apply — pinging in case you'd like to re-confirm before merge.

[ashm-dev]

The Ubuntu (free-threading) / build and test failure is unrelated — the runner received a shutdown signal mid-run (exit code 143, "runner has received a shutdown signal"). All tests passed up to that point. A rerun should be green.