Add check for the PyArg_ParseTuple format, and declare
it if it is supported.
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 8448439..6407871 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -40,6 +40,9 @@
/* Define to 1 if you have the <asm/types.h> header file. */
#undef HAVE_ASM_TYPES_H
+/* Define if GCC supports __attribute__((format(PyArg_ParseTuple, 2, 3))) */
+#undef HAVE_ATTRIBUTE_FORMAT_PARSETUPLE
+
/* Define to 1 if you have the `bind_textdomain_codeset' function. */
#undef HAVE_BIND_TEXTDOMAIN_CODESET