Fix warnings for PyEval_GetCoroutineWrapper

Include/ceval.h

@@ -24,7 +24,7 @@ PyAPI_FUNC(PyObject *) PyEval_CallMethod(PyObject *obj,
 PyAPI_FUNC(void) PyEval_SetProfile(Py_tracefunc, PyObject *);
 PyAPI_FUNC(void) PyEval_SetTrace(Py_tracefunc, PyObject *);
 PyAPI_FUNC(void) PyEval_SetCoroutineWrapper(PyObject *wrapper);
-PyAPI_FUNC(PyObject *) PyEval_GetCoroutineWrapper();
+PyAPI_FUNC(PyObject *) PyEval_GetCoroutineWrapper(void);
 #endif
 
 struct _frame; /* Avoid including frameobject.h */

Python/ceval.c

@@ -4414,7 +4414,7 @@ PyEval_SetCoroutineWrapper(PyObject *wrapper)
 }
 
 PyObject *
-PyEval_GetCoroutineWrapper()
+PyEval_GetCoroutineWrapper(void)
 {
     PyThreadState *tstate = PyThreadState_GET();
     return tstate->coroutine_wrapper;