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/_tkinter.c b/Modules/_tkinter.c
index 01d1069..81ec6a0 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -869,7 +869,7 @@
 	0,				/*tp_print*/
 	0,				/*tp_getattr*/
 	0,				/*tp_setattr*/
-	0,				/*tp_compare*/
+	0,				/*tp_reserved*/
 	(reprfunc)PyTclObject_repr,	/*tp_repr*/
 	0,				/*tp_as_number*/
 	0,				/*tp_as_sequence*/
@@ -2351,7 +2351,7 @@
 	0,				     /*tp_print */
 	0,				     /*tp_getattr */
 	0,				     /*tp_setattr */
-	0,				     /*tp_compare */
+	0,				     /*tp_reserved */
 	Tktt_Repr,			     /*tp_repr */
 	0,				     /*tp_as_number */
 	0,				     /*tp_as_sequence */
@@ -2677,7 +2677,7 @@
 	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 */