Deletion of some firstorder calls in FSetAVL: 
Deletion of some firstorder calls in FSetAVL: 

 after commit 9983 of Bruno concerning kernel/closure.ml, 
 a few firstorder were awfully slow. 



git-svn-id: a49b465eaba45b67e2e1e4e0b2c256a71f59fecb@9994 85f007b7-540e-0410-9357-904b9bb8a0f7

SamB/coq