Remove unused open.
Remove unused open.

silene/coq,gares/coq,coq/coq,Zimmi48/coq,william-lawvere/coq,amintimany/coq,maximedenes/coq,silene/coq,maximedenes/coq,Lionel-Rieg/coq,gares/coq,Matafou/coq,JasonGross/coq,ejgallego/coq,SkySkimmer/coq,Lionel-Rieg/coq,Lionel-Rieg/coq,letouzey/coq-wip,letouzey/coq-wip,maximedenes/coq,letouzey/coq-wip,coq/coq,ppedrot/coq,Matafou/coq,william-lawvere/coq,maximedenes/coq,SkySkimmer/coq,Zimmi48/coq,JasonGross/coq,ejgallego/coq,ppedrot/coq,SkySkimmer/coq,JasonGross/coq,maximedenes/coq,ppedrot/coq,amintimany/coq,amintimany/coq,ejgallego/coq,letouzey/coq-wip,JasonGross/coq,gares/coq,Matafou/coq,Zimmi48/coq,ppedrot/coq,ppedrot/coq,SkySkimmer/coq,ejgallego/coq,coq/coq,silene/coq,letouzey/coq-wip,gares/coq,gares/coq,Zimmi48/coq,william-lawvere/coq,coq/coq