add last backwards-compatible version

pfc/iterators.h

@@ -1,5 +1,4 @@
 #pragma once
-#include "ref_counter.h"
 
 namespace pfc {
 	//! Base class for list nodes. Implemented by list implementers.
@@ -7,7 +6,7 @@ namespace pfc {
 	public:
 		typedef _list_node<t_item> t_self;
 
-        template<typename ... arg_t> _list_node(arg_t && ... arg) : m_content( std::forward<arg_t>(arg) ...) {}
+		TEMPLATE_CONSTRUCTOR_FORWARD_FLOOD(_list_node,m_content)
 
 		t_item m_content;