gh-112075: Remove _PyObject_SetManagedDict() function (#139737)

Move it to the internal C API and no longer export it.

Author: vstinner

Include/cpython/object.h

@@ -442,7 +442,6 @@ PyAPI_FUNC(int) _Py_ReachedRecursionLimitWithMargin(PyThreadState *tstate, int m
 PyAPI_FUNC(void *) PyObject_GetItemData(PyObject *obj);
 
 PyAPI_FUNC(int) PyObject_VisitManagedDict(PyObject *obj, visitproc visit, void *arg);
-PyAPI_FUNC(int) _PyObject_SetManagedDict(PyObject *obj, PyObject *new_dict);
 PyAPI_FUNC(void) PyObject_ClearManagedDict(PyObject *obj);
 
 

Include/internal/pycore_object.h

@@ -1031,7 +1031,8 @@ enum _PyAnnotateFormat {
     _Py_ANNOTATE_FORMAT_STRING = 4,
 };
 
-int _PyObject_SetDict(PyObject *obj, PyObject *value);
+extern int _PyObject_SetDict(PyObject *obj, PyObject *value);
+extern int _PyObject_SetManagedDict(PyObject *obj, PyObject *new_dict);
 
 #ifndef Py_GIL_DISABLED
 static inline Py_ALWAYS_INLINE void _Py_INCREF_MORTAL(PyObject *op)