Some IO tests return alternate error codes on windows
Some IO tests return alternate error codes on windows

Now these tests allow different kinds of error codes. However, I currently
duplicate the is_io_error? method; I would assume there would be an easier
way to do this; maybe just put it in a namespace and reference the
namespace?

kimshrier/elixir,gfvcastro/elixir,kelvinst/elixir,antipax/elixir,ggcampinho/elixir,ggcampinho/elixir,kimshrier/elixir,gfvcastro/elixir,pedrosnk/elixir,joshprice/elixir,pedrosnk/elixir,beedub/elixir,beedub/elixir,michalmuskala/elixir,lexmag/elixir,lexmag/elixir,elixir-lang/elixir,antipax/elixir,kelvinst/elixir