repair accidental change in macro usage (used to be CPYTHON, was accidentally...

repair accidental change in macro usage (used to be CPYTHON, was accidentally changed to PYPY in a previous commit)

Cython/Utility/Coroutine.c

@@ -1486,7 +1486,7 @@ static void __Pyx__ReturnWithStopIteration(PyObject* value); /*proto*/
 
 static void __Pyx__ReturnWithStopIteration(PyObject* value) {
     PyObject *exc, *args;
-#if CYTHON_COMPILING_IN_PYPY || CYTHON_COMPILING_IN_PYSTON
+#if CYTHON_COMPILING_IN_CPYTHON || CYTHON_COMPILING_IN_PYSTON
     __Pyx_PyThreadState_declare
     if ((PY_VERSION_HEX >= 0x03030000 && PY_VERSION_HEX < 0x030500B1) || unlikely(PyTuple_Check(value))) {
         args = PyTuple_New(1);