Remove a useless warning in CoqIDE.
Remove a useless warning in CoqIDE.

Zimmi48/coq,coq/coq,Zimmi48/coq,ejgallego/coq,Zimmi48/coq,SkySkimmer/coq,ejgallego/coq,ejgallego/coq,coq/coq,coq/coq,SkySkimmer/coq,SkySkimmer/coq,ejgallego/coq,coq/coq,SkySkimmer/coq,Zimmi48/coq