turn PyErr_WarnPy3k into a macro

Include/warnings.h

@@ -9,7 +9,8 @@ PyAPI_FUNC(void) _PyWarnings_Init(void);
 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)

Misc/NEWS

@@ -409,8 +409,7 @@ C API
   which provide the functions through their libm. The files also
   contains several helpers and constants for math.
 
-- Added a new convenience function, PyErr_WarnPy3k, for issuing Py3k
-  warnings.
+- Added a new convenience macro, PyErr_WarnPy3k, for issuing Py3k warnings.
 
 
 What's New in Python 2.6 alpha 2?

Python/_warnings.c

@@ -775,15 +775,6 @@ PyErr_WarnExplicit(PyObject *category, const char *text,
 }
 
 
-int
-PyErr_WarnPy3k(const char *text, Py_ssize_t stacklevel)
-{
-    if (Py_Py3kWarningFlag)
-        return PyErr_WarnEx(PyExc_DeprecationWarning, text, stacklevel);
-    return 0;
-}
-
-
 PyDoc_STRVAR(warn_doc,
 "Issue a warning, or maybe ignore it or raise an exception.");