How to detect static build?

[samoconnor]

What is the best (standard?) way to detect a static-julia build ?
Perhaps there should be Base.is_static_julia() -> Bool ?

I currently have the following at the bottom of my main module to check for the outputo option:

if Base.JLOptions().outputo != Ptr{UInt8}(0)

    Base.@ccallable function julia_main(args::Vector{String})::Cint
        init(args)
        return 0
    end

else
    init(ARGS)
end

end # mymodule