fix build.cmd for beta4
fix build.cmd for beta4

xdegtyarev/omnisharp-roslyn,david-driscoll/omnisharp-roslyn,DustinCampbell/omnisharp-roslyn,hal-ler/omnisharp-roslyn,hach-que/omnisharp-roslyn,sreal/omnisharp-roslyn,khellang/omnisharp-roslyn,DustinCampbell/omnisharp-roslyn,hitesh97/omnisharp-roslyn,fishg/omnisharp-roslyn,hach-que/omnisharp-roslyn,RichiCoder1/omnisharp-roslyn,david-driscoll/omnisharp-roslyn,OmniSharp/omnisharp-roslyn,hitesh97/omnisharp-roslyn,hal-ler/omnisharp-roslyn,xdegtyarev/omnisharp-roslyn,fishg/omnisharp-roslyn,ianbattersby/omnisharp-roslyn,sriramgd/omnisharp-roslyn,haled/omnisharp-roslyn,RichiCoder1/omnisharp-roslyn,nabychan/omnisharp-roslyn,jtbm37/omnisharp-roslyn,sreal/omnisharp-roslyn,OmniSharp/omnisharp-roslyn,jtbm37/omnisharp-roslyn,ChrisHel/omnisharp-roslyn,ChrisHel/omnisharp-roslyn,nabychan/omnisharp-roslyn,haled/omnisharp-roslyn,khellang/omnisharp-roslyn,sriramgd/omnisharp-roslyn,ianbattersby/omnisharp-roslyn