Stream: remove unused Sapp constructor
Stream: remove unused Sapp constructor

SkySkimmer/coq,SkySkimmer/coq,Zimmi48/coq,Zimmi48/coq,ejgallego/coq,coq/coq,Zimmi48/coq,SkySkimmer/coq,SkySkimmer/coq,Zimmi48/coq,coq/coq,coq/coq,ejgallego/coq,coq/coq,ejgallego/coq,ejgallego/coq