Export _PyDict_CopyAsDict() function

Author: vstinner

Include/internal/pycore_dict.h

@@ -160,7 +160,8 @@ extern void _PyDict_Clear_LockHeld(PyObject *op);
 PyAPI_FUNC(void) _PyDict_EnsureSharedOnRead(PyDictObject *mp);
 #endif
 
-extern PyObject* _PyDict_CopyAsDict(PyObject *op);
+// Export for '_elementtree' shared extension
+PyAPI_FUNC(PyObject*) _PyDict_CopyAsDict(PyObject *op);
 
 #define DKIX_EMPTY (-1)
 #define DKIX_DUMMY (-2)  /* Used internally */