Allow betaiota when checking unification of the types of metas (fixes ATBR contrib).
Allow betaiota when checking unification of the types of metas (fixes ATBR contrib).

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@14032 85f007b7-540e-0410-9357-904b9bb8a0f7

jhjourdan/coq,tomprince/coq,maximedenes/coq,JasonGross/coq,TOSPIO/coq,8l/coq,shindere/coq,aspiwack/coq,william-lawvere/coq,asr/coq,ppedrot/coq,8l/coq,gares/coq,Ptival/coq,herbelin/github-coq,ejgallego/coq,coq/coq,JasonGross/coq,coq/coq,Zimmi48/coq,TOSPIO/coq,gares/coq,ale-f/coq,letouzey/coq-wip,asr/coq,letouzey/coq-wip,letouzey/coq-wip,silene/coq,gmalecha/coq,letouzey/coq-wip,Lionel-Rieg/coq,coq/coq,ejgallego/coq,ppedrot/coq,TOSPIO/coq,silene/coq,jpdeplaix/coq,barras/coq,maximedenes/coq,SkySkimmer/coq,pirapira/coq2rust,SkySkimmer/coq,Zimmi48/coq,pirapira/coq2rust,ale-f/coq,shindere/coq,ppedrot/coq,amintimany/coq,mlasson/coq,silene/coq,maximedenes/coq,Matafou/coq,Lionel-Rieg/coq,barras/coq,TheTypoMaster/coq,Matafou/coq,pirbo/coq,gmalecha/coq,8l/coq,pirbo/coq,gmalecha/coq,gares/coq,SkySkimmer/coq,Ptival/coq,gares/coq,mattam82/coq,asr/coq,TheTypoMaster/coq,ppedrot/coq,barras/coq,letouzey/coq-wip,shindere/coq,jhjourdan/coq,Lionel-Rieg/coq,pirapira/coq2rust,coq/coq,Matafou/coq,JasonGross/coq,gares/coq,jpdeplaix/coq,william-lawvere/coq,william-lawvere/coq,mattam82/coq,SkySkimmer/coq,maximedenes/coq,jpdeplaix/coq,ppedrot/coq,tomprince/coq,mlasson/coq,tomprince/coq,jhjourdan/coq,ale-f/coq,Ptival/coq,mlasson/coq,ejgallego/coq,amintimany/coq,mattam82/coq,maximedenes/coq,ejgallego/coq,herbelin/github-coq,Zimmi48/coq,aspiwack/coq,amintimany/coq,aspiwack/coq,Zimmi48/coq,herbelin/github-coq,TheTypoMaster/coq,pirbo/coq,JasonGross/coq