Remove GC macros as GC is gone from base

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/dbuskit/trunk@39612 72102866-910b-0410-8b05-ffd578937521

Source/DKNotificationCenter.m

@@ -519,7 +519,7 @@
   {
     return nil;
   }
-  observer = GS_GC_HIDE(anObserver);
+  observer = anObserver;
   selector = aSelector;
 
   // Make sure the necessary components are there and that the selector takes a
@@ -535,7 +535,7 @@
 
 - (id)observer
 {
-  return GS_GC_UNHIDE(observer);
+  return observer;
 }
 
 - (SEL)selector
@@ -561,7 +561,7 @@
   // 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]];