Removed NilClass from the shared Mac OS X files (objc_darwin.h and bleh_darwin.m) as the //export issue that required that no longer applies.

bleh_darwin.m

@@ -21,9 +21,6 @@ though this is not always the case.
 #include <AppKit/NSBitmapImageRep.h>
 #include <AppKit/NSCell.h>
 
-/* exception to the above: cgo doesn't like Nil and delegate_darwin.go has //export so I can't have this there */
-Class NilClass = Nil;
-
 /* used by listbox_darwin.go; requires NSString */
 id *_NSObservedObjectKey = (id *) (&NSObservedObjectKey);
 

objc_darwin.go

@@ -10,6 +10,8 @@ import (
 // #cgo LDFLAGS: -lobjc -framework Foundation
 // #include <stdlib.h>
 // #include "objc_darwin.h"
+// /* cgo doesn't like Nil */
+// Class NilClass = Nil;
 import "C"
 
 func objc_getClass(class string) C.id {

objc_darwin.h

@@ -20,9 +20,6 @@ The format should be self-explanatory.
 
 #include <stdint.h>
 
-/* for delegate_darwin.go */
-extern Class NilClass;
-
 /* for listbox_darwin.go */
 extern id *_NSObservedObjectKey;