Remove commented out "functor" converter.
Remove commented out "functor" converter.

functor was removed a long time ago.

rpavlik/luabind,rpavlik/luabind,lonski/luabind,mapbox/luabind,galek/luabind-deboostified,MrApplejuice/luabind,Oberon00/luabind,alex85k/luabind,luabind/luabind,decimad/luabind-deboostified,alex85k/luabind,plsytj/luabind,rpavlik/luabind,davidar/luabind,Wohlhabend-Networks/luabind-deboostified,rpavlik/luabind,luabind/luabind,Kazade/luabind-deboostified,luabind/luabind,alex85k/luabind,ltjax/luabind-deboostified,grafi-tt/luabind,mdave88/luabind,alex85k/luabind,Oberon00/luabind,rpavlik/luabind,luabind/luabind