move ruby_method out of rubyx

ruby getting ready for destruction as it’s not used anymore

test/vool/compilers/test_method_compiler.rb

@@ -33,7 +33,7 @@ module Vool
     def test_creates_method_in_class
       method = create_method
       assert method , "No method created"
-      assert_equal Rubyx::RubyMethod , method.class
+      assert_equal Vool::VoolMethod , method.class
     end