Fixed unreachable code issue

src/System.Management.Automation/engine/SecurityManagerBase.cs

@@ -94,7 +94,7 @@ namespace System.Management.Automation
             // On non-Windows platform Set/Get-ExecutionPolicy return  
             // Operation is not supported on this platform.
             return;
-#endif
+#else
 
 
 #if DEBUG
@@ -160,6 +160,7 @@ namespace System.Management.Automation
                     throw new PSSecurityException(AuthorizationManagerBase.AuthorizationManagerDefaultFailureReason);
                 }
             }
+#endif            
         }
 
         /// <summary>

src/System.Management.Automation/security/SecuritySupport.cs

@@ -435,7 +435,7 @@ namespace System.Management.Automation
             // There is no signature support on non-Windows platforms (yet), when
             // execution reaches here, we are sure the file is under product folder
             return true;
-#endif
+#else
             // Check the file signature
             Signature fileSignature = SignatureHelper.GetSignature(file, null);
             if ((fileSignature != null) && (fileSignature.IsOSBinary))
@@ -455,6 +455,7 @@ namespace System.Management.Automation
             }
 
             return false;
+#endif
         }
 
 #if !CORECLR