wine-master: `readline(stdin)` is broken

[Keno]

The following hangs on wine master:

open(`$(Base.julia_cmd()) -e 'println(readline(stdin))'`, "r+") do f
    print(f.in, "hello", "\n")
    @info readline(f)
end

[Keno]

Root cause is that CancelSynchronousIo isn't implemented in Wine.

[Keno]

WIP commit to implement that at JuliaComputing/wine-staging@eec7bac, but not of upstreamable quality yet (also upstream is in code freeze).