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*/
diff --git a/PC/_subprocess.c b/PC/_subprocess.c
index 8c9a352..99cbd24 100644
--- a/PC/_subprocess.c
+++ b/PC/_subprocess.c
@@ -133,7 +133,7 @@
 	0, /*tp_print*/
 	0,				/*tp_getattr*/
 	0,				/*tp_setattr*/
-	0,				/*tp_compare*/
+	0,				/*tp_reserved*/
 	0,				/*tp_repr*/
 	&sp_handle_as_number,		/*tp_as_number */
 	0,				/*tp_as_sequence */
diff --git a/PC/winreg.c b/PC/winreg.c
index 8a4a215..7e8ea10 100644
--- a/PC/winreg.c
+++ b/PC/winreg.c
@@ -485,7 +485,7 @@
 	0,				/* tp_print */
 	0,				/* tp_getattr */
 	0,				/* tp_setattr */
-	0,				/* tp_compare */
+	0,				/* tp_reserved */
 	0,				/* tp_repr */
 	&PyHKEY_NumberMethods,		/* tp_as_number */
 	0,				/* tp_as_sequence */