final gpu-enabling tweaks

include/boost/fusion/iterator/iterator_adapter.hpp

@@ -24,6 +24,7 @@ namespace boost { namespace fusion
         iterator_base_type;
         iterator_base_type iterator_base;
 
+        BOOST_FUSION_GPU_ENABLED
         iterator_adapter(iterator_base_type const& iterator_base_)
             : iterator_base(iterator_base_) {}