[tests] [linksdk] Add a dummy interface for an interface provided by our old NUnitLite.

It didn't look like this interface was used anywhere expect to check for its
presence, so just provide another, identically named, interface.

tests/linker/ios/link sdk/AotBugs.cs

@@ -35,6 +35,9 @@ namespace LinkSdk.Aot {
 	
 	interface IAotTest {
 	}
+
+	interface IExpectException {
+	}
 	
 	[TestFixture]
 	// already done in Bug2096Test.cs -> [Preserve (AllMembers = true)]