Added PyErr_WarnPy3k function. (issue 2671) I will be converting current Py3k warnings to the use of this function soon.
diff --git a/Include/warnings.h b/Include/warnings.h
index 5d13431..e761ade 100644
--- a/Include/warnings.h
+++ b/Include/warnings.h
@@ -9,6 +9,7 @@
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);
/* DEPRECATED: Use PyErr_WarnEx() instead. */
#define PyErr_Warn(category, msg) PyErr_WarnEx(category, msg, 1)