[default.nix] Drop dependency to ocp-index
[default.nix] Drop dependency to ocp-index

ejgallego/coq,gares/coq,coq/coq,SkySkimmer/coq,silene/coq,Matafou/coq,Zimmi48/coq,ejgallego/coq,silene/coq,ppedrot/coq,ppedrot/coq,Zimmi48/coq,JasonGross/coq,SkySkimmer/coq,Zimmi48/coq,coq/coq,maximedenes/coq,gares/coq,Zimmi48/coq,coq/coq,JasonGross/coq,JasonGross/coq,Matafou/coq,ppedrot/coq,ppedrot/coq,gares/coq,SkySkimmer/coq,maximedenes/coq,gares/coq,JasonGross/coq,SkySkimmer/coq,coq/coq,ejgallego/coq,maximedenes/coq,ppedrot/coq,ejgallego/coq,silene/coq,gares/coq,maximedenes/coq,Matafou/coq,maximedenes/coq