bpo-41834: Remove _Py_CheckRecursionLimit variable #22359
   Merged  
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Remove the global _Py_CheckRecursionLimit variable: it has been
replaced by ceval.recursion_critical of the PyInterpreterState
structure.
There is no need to keep the variable for the stable ABI, since
Py_EnterRecursiveCall() and Py_LeaveRecursiveCall() were not usable
in Python 3.8 and older: these macros accessed PyThreadState members,
whereas the PyThreadState structure is opaque in the limited C API.
https://bugs.python.org/issue41834