Don't attempt to generate protocol methods for nowait versions

Author: michaelklishin

projects/client/Apigen/src/apigen/Apigen.cs

@@ -832,6 +832,8 @@ public void MaybeEmitModelMethod(MethodInfo method) {
             if (method.IsSpecialName) {
                 // It's some kind of event- or property-related method.
                 // It shouldn't be autogenerated.
+            } else if (method.Name.EndsWith("Nowait")) {
+                // Skip *Nowait versions
             } else if (Attribute(method, typeof(AmqpMethodDoNotImplementAttribute)) != null) {
                 // Skip this method, by request (AmqpMethodDoNotImplement)
             } else if (Attribute(method, typeof(AmqpContentHeaderFactoryAttribute)) != null) {