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/Include/object.h b/Include/object.h
index 30538b5..592ee02 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -297,7 +297,7 @@
 	printfunc tp_print;
 	getattrfunc tp_getattr;
 	setattrfunc tp_setattr;
-	cmpfunc tp_compare;
+	cmpfunc tp_reserved;
 	reprfunc tp_repr;
 
 	/* Method suites for standard classes */