Revert fiat-crypto overlay
Revert fiat-crypto overlay

Not a useful overlay.  Fiat-crypto has since been updated to pass
-compat 8.6.

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