No mapping for callbacks with parameters as reference

```
A NSMenu delegate implementing 

menuHasKeyEquivalent_forEvent_target_action(NSMenu menu, NSEvent event, ID 
target, Selector action);

is not possible. There is no specific mapping in NSInvocationMapperLookup for 
the selector argument. This is mapped to NativeLong instead.


```

Original issue reported on code.google.com by `dkocher@sudo.ch` on 1 Oct 2010 at 3:05
