Fixed type printing of hidden structure parameters in C#.

src/Generator/Generators/CSharp/CSharpTypePrinter.cs

@@ -365,12 +365,8 @@ namespace CppSharp.Generators.CSharp
         {
             var paramType = parameter.Type;
 
-            Class @class;
+            if (parameter.Kind == ParameterKind.HiddenStructureReturn)
-            if (paramType.Desugar().IsTagDecl(out @class)
+                return "global::System.IntPtr";
-                && ContextKind == CSharpTypePrinterContextKind.Native)
-            {
-                return string.Format("{0}.Internal", @class.Name);
-            }
 
             return paramType.Visit(this);
         }