[ci] Download ci-sf archives into the proper CI build dir.
[ci] Download ci-sf archives into the proper CI build dir.

Currently, `make ci-sf` downloads and builds the files in the main root
directory. we fix that.

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