Remove the artificial dependency of Heads on evaluable_global_reference.
Remove the artificial dependency of Heads on evaluable_global_reference.

Zimmi48/coq,coq/coq,ejgallego/coq,ejgallego/coq,SkySkimmer/coq,silene/coq,JasonGross/coq,silene/coq,JasonGross/coq,Zimmi48/coq,coq/coq,JasonGross/coq,SkySkimmer/coq,ejgallego/coq,JasonGross/coq,ejgallego/coq,Zimmi48/coq,coq/coq,SkySkimmer/coq,silene/coq,coq/coq,SkySkimmer/coq,Zimmi48/coq