Fix build by always including the System.Diagnostics.CodeAnalysis namespace. (#110)

rolfbjarne · web-flow · commit ac2647b64369 · 2022-12-01T17:22:25.000+01:00
This way we find the NotNullWhen attribute declared at the bottom of this file.
diff --git a/Xamarin.MacDev/MacCatalystSupport.cs b/Xamarin.MacDev/MacCatalystSupport.cs
@@ -26,9 +26,7 @@
 #nullable enable
 
 using System;
-#if NET
 using System.Diagnostics.CodeAnalysis;
-#endif
 using System.Collections.Generic;
 using System.IO;
 
