Remove test checking for failure when NOT using "typename"/TPL macro

This is allowed in C++20 and doesn't need to be tested anyway.

test/fail_template_argument_without_tpl_macro.cpp

@@ -1,18 +0,0 @@
-// http://turtle.sourceforge.net
-//
-// Copyright Mathieu Champlon 2011
-//
-// Distributed under the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt)
-
-#include <turtle/mock.hpp>
-
-namespace
-{
-    template< typename T >
-    MOCK_CLASS( my_class )
-    {
-        MOCK_METHOD_EXT( my_method, 1, void( T ), my_method )
-    };
-}