turn PyErr_WarnPy3k into a macro
diff --git a/Include/warnings.h b/Include/warnings.h
index e761ade..79ef9f3 100644
--- a/Include/warnings.h
+++ b/Include/warnings.h
@@ -9,7 +9,8 @@
PyAPI_FUNC(int) PyErr_WarnEx(PyObject *, const char *, Py_ssize_t);
PyAPI_FUNC(int) PyErr_WarnExplicit(PyObject *, const char *, const char *, int,
const char *, PyObject *);
-PyAPI_FUNC(int) PyErr_WarnPy3k(const char *, Py_ssize_t);
+
+#define PyErr_WarnPy3k(msg, stacklevel) (Py_Py3kWarningFlag ? PyErr_WarnEx(PyExc_DeprecationWarning, msg, stacklevel) : 0)
/* DEPRECATED: Use PyErr_WarnEx() instead. */
#define PyErr_Warn(category, msg) PyErr_WarnEx(category, msg, 1)