bpo-41834: Remove _Py_CheckRecursionLimit variable (GH-22359)

Remove the global _Py_CheckRecursionLimit variable: it has been
replaced by ceval.recursion_limit of the PyInterpreterState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.

Tools/c-analyzer/TODO

@@ -66,7 +66,6 @@ Objects/tupleobject.c:_Py_tuple_zero_allocs                      Py_ssize_t _Py_
 Objects/typeobject.c:next_version_tag                            static unsigned int next_version_tag
 Python/Python-ast.c:init_types():initialized                     static int initialized
 Python/bootstrap_hash.c:urandom_cache                            static struct { int fd; dev_t st_dev; ino_t st_ino; } urandom_cache
-Python/ceval.c:_Py_CheckRecursionLimit                           int _Py_CheckRecursionLimit
 Python/ceval.c:lltrace                                           static int lltrace
 Python/ceval.c:make_pending_calls():busy                         static int busy
 Python/dynload_shlib.c:handles                                   static struct { dev_t dev; ino_t ino; void *handle; } handles[128]

Tools/c-analyzer/known.tsv

@@ -805,7 +805,6 @@ Objects/iterobject.c	-	PyCallIter_Type	variable	PyTypeObject PyCallIter_Type
 Objects/capsule.c	-	PyCapsule_Type	variable	PyTypeObject PyCapsule_Type
 Objects/cellobject.c	-	PyCell_Type	variable	PyTypeObject PyCell_Type
 Objects/methodobject.c	-	PyCFunction_Type	variable	PyTypeObject PyCFunction_Type
-Python/ceval.c	-	_Py_CheckRecursionLimit	variable	int _Py_CheckRecursionLimit
 Objects/descrobject.c	-	PyClassMethodDescr_Type	variable	PyTypeObject PyClassMethodDescr_Type
 Objects/funcobject.c	-	PyClassMethod_Type	variable	PyTypeObject PyClassMethod_Type
 Objects/codeobject.c	-	PyCode_Type	variable	PyTypeObject PyCode_Type