Remove dead code in dnets.
Remove dead code in dnets.

The boolean assumedly used to cut recursion was always set to true, since
its introduction in 64ac193.

JasonGross/coq,ejgallego/coq,silene/coq,ejgallego/coq,Zimmi48/coq,JasonGross/coq,SkySkimmer/coq,Zimmi48/coq,silene/coq,gares/coq,gares/coq,gares/coq,Zimmi48/coq,coq/coq,JasonGross/coq,SkySkimmer/coq,coq/coq,SkySkimmer/coq,ejgallego/coq,JasonGross/coq,coq/coq,gares/coq,Zimmi48/coq,ejgallego/coq,silene/coq,SkySkimmer/coq,coq/coq,gares/coq