[jcw-gen] Do not register static methods on an interface.

Author: jpobst

src/Java.Interop.Tools.JavaCallableWrappers/Java.Interop.Tools.JavaCallableWrappers/JavaCallableWrapperGenerator.cs

@@ -153,7 +153,8 @@ void AddNestedTypes (TypeDefinition type)
 						return d;
 					})
 					.Where (d => GetRegisterAttributes (d).Any ())
-					.SelectMany (d => d.Methods)) {
+					.SelectMany (d => d.Methods)
+					.Where (m => !m.IsStatic)) {
 				AddMethod (imethod, imethod);
 			}