fix PyMethod_New() in pypy3

Cython/Compiler/ExprNodes.py

@@ -7518,7 +7518,7 @@ class BoundMethodNode(ExprNode):
 
     def generate_result_code(self, code):
         code.putln(
-            "%s = PyMethod_New(%s, %s, (PyObject*)%s->ob_type); %s" % (
+            "%s = __Pyx_PyMethod_New(%s, %s, (PyObject*)%s->ob_type); %s" % (
                 self.result(),
                 self.function.py_result(),
                 self.self_object.py_result(),
@@ -7550,7 +7550,7 @@ class UnboundMethodNode(ExprNode):
     def generate_result_code(self, code):
         class_cname = code.pyclass_stack[-1].classobj.result()
         code.putln(
-            "%s = PyMethod_New(%s, 0, %s); %s" % (
+            "%s = __Pyx_PyMethod_New(%s, 0, %s); %s" % (
                 self.result(),
                 self.function.py_result(),
                 class_cname,

Cython/Utility/CythonFunction.c

@@ -545,13 +545,12 @@ static PyObject *__Pyx_CyFunction_descr_get(PyObject *func, PyObject *obj, PyObj
     if (m->flags & __Pyx_CYFUNCTION_CLASSMETHOD) {
         if (type == NULL)
             type = (PyObject *)(Py_TYPE(obj));
-        return PyMethod_New(func,
-                            type, (PyObject *)(Py_TYPE(type)));
+        return __Pyx_PyMethod_New(func, type, (PyObject *)(Py_TYPE(type)));
     }
 
     if (obj == Py_None)
         obj = NULL;
-    return PyMethod_New(func, obj, type);
+    return __Pyx_PyMethod_New(func, obj, type);
 }
 
 static PyObject*

Cython/Utility/ModuleSetupCode.c

@@ -168,7 +168,13 @@
 #endif
 
 #if PY_MAJOR_VERSION >= 3
-  #define PyMethod_New(func, self, klass) ((self) ? PyMethod_New(func, self) : PyInstanceMethod_New(func))
+  #define __Pyx_PyMethod_New(func, self, klass) ((self) ? PyMethod_New(func, self) : PyInstanceMethod_New(func))
+  #ifndef PyMethod_New
+    /* for backwards compatibility only, but PyPy redefines PyMethod_New unconditionally */
+    #define PyMethod_New(func, self, klass) __Pyx_PyMethod_New(func, self, klass)
+  #endif
+#else
+  #define __Pyx_PyMethod_New(func, self, klass) PyMethod_New(func, self, klass)
 #endif
 
 /* inline attribute */