delete old build definition file (#7662)
delete old build definition file (#7662)

Only the 16.3 build uses this file and that branch still has a copy.
dsyme/fsharp,dsyme/fsharp,dsyme/fsharp,dsyme/fsharp,cloudRoutine/FSharp.Compiler.Service,dsyme/fsharp,dsyme/fsharp,dsyme/fsharp,cloudRoutine/FSharp.Compiler.Service,cloudRoutine/FSharp.Compiler.Service