Issue #1717: rename tp_compare to tp_reserved.  I'll change the
type of tp_compare in a separate commit, for ease of reversion
should things go wrong.
diff --git a/Modules/pyexpat.c b/Modules/pyexpat.c
index ce72885..a968e52 100644
--- a/Modules/pyexpat.c
+++ b/Modules/pyexpat.c
@@ -1622,7 +1622,7 @@
 	(printfunc)0,		/*tp_print*/
 	0,			/*tp_getattr*/
 	(setattrfunc)xmlparse_setattr,	/*tp_setattr*/
-	0,			/*tp_compare*/
+	0,			/*tp_reserved*/
 	(reprfunc)0,		/*tp_repr*/
 	0,			/*tp_as_number*/
 	0,		/*tp_as_sequence*/