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/symtable.c b/Python/symtable.c
index e3bb270..17876ea 100644
--- a/Python/symtable.c
+++ b/Python/symtable.c
@@ -130,7 +130,7 @@
 	0,                                      /* tp_print */
 	0,			               /* tp_getattr */
 	0,					/* tp_setattr */
-	0,			                /* tp_compare */
+	0,			                /* tp_reserved */
 	(reprfunc)ste_repr,			/* tp_repr */
 	0,					/* tp_as_number */
 	0,			                /* tp_as_sequence */