[configure] Remove duplicate word in output.
[configure] Remove duplicate word in output.

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