Use Security.Permissions stub

src/Microsoft.PowerShell.Commands.Utility/commands/utility/trace/MshHostTraceListener.cs

@@ -3,12 +3,17 @@ Copyright (c) Microsoft Corporation.  All rights reserved.
 --********************************************************************/
 using System;
 using System.IO;
-using System.Security.Permissions;
 using System.Text;
 using System.Management.Automation;
 using System.Management.Automation.Host;
 using System.Management.Automation.Internal.Host;
 
+#if CORECLR
+using Microsoft.PowerShell.CoreClr.Stubs;
+#else
+using System.Security.Permissions;
+#endif
+
 namespace Microsoft.PowerShell.Commands
 {
 	/// <summary>