Remove unused file.

src/Security/sec_identity_t.cs

@@ -1,28 +0,0 @@
-//
-// SecIdentity2.cs: Bindings the Security's sec_identity_t
-//
-// The difference between SecIdentity2 and SecIdentity is that the
-// SecIdentity2 is a binding for the new sec_identity_t API that was
-// introduced on iOS 12/OSX Mojave, while SecIdentity is the older API
-// that binds SecIdentityRef.
-//
-// Authors:
-//   Miguel de Icaza (miguel@microsoft.com)
-//
-// Copyrigh 2018 Microsoft Inc
-//
-using System;
-using System.Runtime.InteropServices;
-using System.Runtime.CompilerServices;
-using ObjCRuntime;
-using Foundation;
-using CoreFoundation;
-
-namespace Network {
-	
-	public class SecIdentity2 : NativeObject {
-		public SecIdentity2 (IntPtr handle, bool owns) : base (handle, owns) {}
-
-		
-	}
-}