Add VERSION check around broadcast piracy

src/tracker/array.jl

@@ -424,6 +424,7 @@ end
 using Requires
 
 # https://github.com/FluxML/Flux.jl/issues/353
+if VERSION < v"1.1.0-DEV.548"
   @init Requires.isprecompiling() || @eval Base.Broadcast begin
     function flatten(bc::Broadcasted{Style}) where {Style}
       isflat(bc) && return bc
@@ -449,3 +450,4 @@ using Requires
       end
     end
   end
+end