* Allow disabling the hack for creating a console for
a GUI application via `ENABLE_CONSOLE=0` to workaround
downsides of this hack (pipes not working, possibly
spawns an additional console)
* Set the console's character set to UTF-8 by default
because this actually seems to work now and
non-ASCII characters are displayed correctly. There
is still an opt-out via `ENABLE_CP_UTF8=0`.
* Note that with mintty it just works anyways so using
that terminal emulator is still the best workaround.