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gh-123321: Make Parser/myreadline.c locking safe in free-threaded build (GH-123690)
Use a `PyMutex` to avoid the race in mutex initialization. Use relaxed
atomics to avoid the data race on reading `_PyOS_ReadlineTState` when
checking for re-entrant calls.
(cherry picked from commit 0c080d7c77)
Co-authored-by: Sam Gross <[email protected]>