Add check for the PyArg_ParseTuple format, and declare
it if it is supported.
diff --git a/Misc/NEWS b/Misc/NEWS
index b0f8f55..e311bad 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -223,6 +223,9 @@
 Build
 -----
 
+- configure now checks whether gcc supports the PyArg_ParseTuple format
+  attribute.
+
 - Bug #1578513: Cross compilation was broken by a change to configure. 
   Repair so that it's back to how it was in 2.4.3.