fix from snapshot
prevent:
> /usr/include/fox-1.7/FXObject.h:54:28: error: ‘FXSelector’ in namespace ‘FX’ does not name a type

--- a/include/FXObject.h
+++ b/include/FXObject.h
@@ -25,6 +25,10 @@
 #include "FXCallback.h"
 #endif
 
+#ifndef FXMETACLASS_H
+#include "FXMetaClass.h"
+#endif
+
 namespace FX {