Fix 'unbound variable' issue on Windows packaging jobs.
Fix 'unbound variable' issue on Windows packaging jobs.

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