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/PC/_msi.c b/PC/_msi.c
index f129293..0df2397 100644
--- a/PC/_msi.c
+++ b/PC/_msi.c
@@ -473,7 +473,7 @@
 	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*/
@@ -643,7 +643,7 @@
 	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*/
@@ -791,7 +791,7 @@
 	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*/
@@ -908,7 +908,7 @@
 	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*/