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/_curses_panel.c b/Modules/_curses_panel.c
index 26cea8c..02e064f 100644
--- a/Modules/_curses_panel.c
+++ b/Modules/_curses_panel.c
@@ -341,7 +341,7 @@
     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*/