Comment # 3 on bug 943757 from Martin Vidner

To reproduce:

# /usr/lib/YaST2/bin/y2base ./hello.rb ncurses
# https://bugzilla.suse.com/show_bug.cgi?id=943757

require "yast"
include Yast::UIShortcuts

$stderr.puts "Hello, stderr! 1" # This succeeds

module Yast
  import "UI"

  UI.OpenDialog(PushButton("Hello, World!"))
  $stderr.puts "Hello, stderr! 2" # Bad file descriptor @ io_write
  UI.UserInput
  UI.CloseDialog
end

I thought that we did redirect to the log, but it turns out that since 2008
ncurses redirects stdout and stderr to /dev/null, even with some suspicious
flags (defaulting to O_RDONLY) which may never have worked:
https://github.com/libyui/libyui-ncurses/blob/8f861f5ccb77a72fdcc17e909f2811102f09d3b1/src/NCurses.cc#L566
    open( log.c_str(), O_APPEND | O_CREAT, 0666 );