Fix nf_evars_universes_opt_subst: recurse on univs, nf undef evars
Fix nf_evars_universes_opt_subst: recurse on univs, nf undef evars

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