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/Python/bltinmodule.c b/Python/bltinmodule.c
index 8cb66c5..9805697 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -416,7 +416,7 @@
 	0,				/* tp_print */
 	0,				/* tp_getattr */
 	0,				/* tp_setattr */
-	0,				/* tp_compare */
+	0,				/* tp_reserved */
 	0,				/* tp_repr */
 	0,				/* tp_as_number */
 	0,				/* tp_as_sequence */
@@ -1017,7 +1017,7 @@
 	0,				/* tp_print */
 	0,				/* tp_getattr */
 	0,				/* tp_setattr */
-	0,				/* tp_compare */
+	0,				/* tp_reserved */
 	0,				/* tp_repr */
 	0,				/* tp_as_number */
 	0,				/* tp_as_sequence */
@@ -2166,7 +2166,7 @@
 	0,				/* tp_print */
 	0,				/* tp_getattr */
 	0,				/* tp_setattr */
-	0,				/* tp_compare */
+	0,				/* tp_reserved */
 	0,				/* tp_repr */
 	0,				/* tp_as_number */
 	0,				/* tp_as_sequence */