Fix "unused function" C compiler warning for "__Pyx_Coroutine_get_frame()".

Cython/Utility/Coroutine.c

@@ -1233,13 +1233,6 @@ static void __Pyx_Coroutine_del(PyObject *self) {
 #endif
 }
 
-static PyObject *
-__Pyx_Coroutine_get_frame(__pyx_CoroutineObject *self)
-{
-    // Fake implementation that always returns None, but at least does not raise an AttributeError.
-    Py_RETURN_NONE;
-}
-
 static PyObject *
 __Pyx_Coroutine_get_name(__pyx_CoroutineObject *self)
 {
@@ -1471,6 +1464,13 @@ static PyObject *__Pyx_Coroutine_await(PyObject *coroutine) {
     return __Pyx__Coroutine_await(coroutine);
 }
 
+static PyObject *
+__Pyx_Coroutine_get_frame(__pyx_CoroutineObject *self)
+{
+    // Fake implementation that always returns None, but at least does not raise an AttributeError.
+    Py_RETURN_NONE;
+}
+
 #if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3 && PY_VERSION_HEX < 0x030500B1
 static PyObject *__Pyx_Coroutine_compare(PyObject *obj, PyObject *other, int op) {
     PyObject* result;