CObject use is marked as a Py3k warning, not a deprecation warning

Misc/NEWS

@@ -25,6 +25,9 @@ Core and Builtins
 - Issue #9862: Compensate for broken PIPE_BUF in AIX by hard coding
   its value as the default 512 when compiling on AIX.
 
+- Issue #9675: CObject use is marked as a Py3k warning, not a deprecation
+  warning.
+
 - Issue #10068: Global objects which have reference cycles with their module's
   dict are now cleared again. This causes issue #7140 to appear again.
 

Objects/cobject.c

@@ -11,8 +11,7 @@ typedef void (*destructor2)(void *, void*);
 
 static int cobject_deprecation_warning(void)
 {
-    return PyErr_WarnEx(PyExc_PendingDeprecationWarning,
-        "The CObject type is marked Pending Deprecation in Python 2.7.  "
+    return PyErr_WarnPy3k("CObject type is not supported in 3.x. "
         "Please use capsule objects instead.", 1);
 }