[ObjCRuntime] Remove dead Selector code. (#16397)

src/ObjCRuntime/Selector.cs

@@ -41,10 +41,6 @@ namespace ObjCRuntime {
 		internal const string Retain = "retain";
 		internal const string Autorelease = "autorelease";
 		internal const string PerformSelectorOnMainThreadWithObjectWaitUntilDone = "performSelectorOnMainThread:withObject:waitUntilDone:";
-#if MONOMAC
-		internal const string DoesNotRecognizeSelector = "doesNotRecognizeSelector:";
-		internal const string PerformSelectorWithObjectAfterDelay = "performSelector:withObject:afterDelay:";
-#endif
 
 		NativeHandle handle;
 		string? name;

src/ObjCRuntime/Selector.mac.cs

@@ -36,9 +36,7 @@ namespace ObjCRuntime {
 		internal static IntPtr ReleaseHandle = Selector.GetHandle (Release);
 		internal static IntPtr RetainHandle = Selector.GetHandle (Retain);
 		internal static IntPtr AutoreleaseHandle = Selector.GetHandle (Autorelease);
-		internal static IntPtr DoesNotRecognizeSelectorHandle = Selector.GetHandle (DoesNotRecognizeSelector);
 		internal static IntPtr PerformSelectorOnMainThreadWithObjectWaitUntilDoneHandle = GetHandle (PerformSelectorOnMainThreadWithObjectWaitUntilDone);
-		internal static IntPtr PerformSelectorWithObjectAfterDelayHandle = GetHandle (PerformSelectorWithObjectAfterDelay);
 	}
 }