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/unicodedata.c b/Modules/unicodedata.c
index 12bda09..ba6d0b1 100644
--- a/Modules/unicodedata.c
+++ b/Modules/unicodedata.c
@@ -1144,7 +1144,7 @@
 	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*/