Univ: avoid recording dummy universe constraints u<=u or u=u
Univ: avoid recording dummy universe constraints u<=u or u=u

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@15026 85f007b7-540e-0410-9357-904b9bb8a0f7

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