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/_lsprof.c b/Modules/_lsprof.c
index 8457de1..43cb9b1 100644
--- a/Modules/_lsprof.c
+++ b/Modules/_lsprof.c
@@ -820,7 +820,7 @@
 	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 */