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/import.c b/Python/import.c
index d741aca..5a2c3cb 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -3295,7 +3295,7 @@
 	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*/