* fixed wrong define which caused the unit to be empty

rtl/win32/messages.pp

@@ -3,9 +3,12 @@ unit messages;
 
 interface
 
-{$DEFINE ReadInterface}
+  uses
+    windows;
+
+{$DEFINE read_interface}
 {$I messages.inc}
 
 implementation
 
-end.
+end.