Garbage Collection is gone, so are their macros

--- Source/DKNotificationCenter.m.orig	Wed Apr 19 11:26:33 2017
+++ Source/DKNotificationCenter.m	Wed Apr 19 11:27:24 2017
@@ -514,7 +514,7 @@
   {
     return nil;
   }
-  observer = GS_GC_HIDE(anObserver);
+  observer = anObserver;
   selector = aSelector;
 
   // Make sure the necessary components are there and that the selector takes a
@@ -530,7 +530,7 @@
 
 - (id)observer
 {
-  return GS_GC_UNHIDE(observer);
+  return observer;
 }
 
 - (SEL)selector
@@ -556,7 +556,7 @@
   // callback and need to avoid the reentrancy. We do this by scheduling
   // delivery of the notification on the run loop.
   [[NSRunLoop currentRunLoop] performSelector: selector
-                                      target: GS_GC_UNHIDE(observer)
+                                      target: observer
 				    argument: notification
 				       order: UINT_MAX
 				       modes: [NSArray arrayWithObject: NSDefaultRunLoopMode]];