On Windows we have an extra script
ghcii.sh that is recommended when we run in a console that does not use
conhost. e.g mintty from msys2 or the cygwin shell.
This is because the sigINT signal is being swallowed by these consoles.
I believe we can work around this by listening to Window messages as well. These consoles do their own drawings, which means they load
Which means they have a message pump so should be receiving Window events. See https://msdn.microsoft.com/en-us/library/windows/desktop/ms686016(v=vs.85).aspx