adding data-transfer direction when getting native datatypes

we are publishing exactly what we have internally when data has to be get, and when setting, we might have more formats we can support

include/wx/osx/dataobj.h

@@ -33,7 +33,7 @@ public:
 
 #if wxOSX_USE_COCOA
     // adds all the native formats (in descending order of preference) this data object supports
-    virtual void AddSupportedTypes( CFMutableArrayRef cfarray) const;
+    virtual void AddSupportedTypes( CFMutableArrayRef cfarray, Direction dir ) const;
 #endif
 };