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/_sqlite/connection.c b/Modules/_sqlite/connection.c
index 7fa69e7..f795523 100644
--- a/Modules/_sqlite/connection.c
+++ b/Modules/_sqlite/connection.c
@@ -1350,7 +1350,7 @@
         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 */