Win32: avoid any automatic LF to CRLF conversions when writing to stdout

* At least the MSVCRT does this by default, i.e. the translation mode of stdout
  is not _O_BINARY.
* This broke piping through SciTECO with --stdin --stdout, as this relies on SciTECO's
  builtin EOL normalization. Instead, you would get DOS linebreaks on output even if the
  source stream contains only UNIX linebreaks.
* It would also break binary filters.
* It seems to be safe to print only LF also for regular stdio (help and error messages),
  so I simply disaply the stdout (and stdin and stderr) EOL translation globally.
* Also fixes Troff warnings due to the .in preprocessor writing output with DOS linebreaks.
* Added a test case. All future platforms shouldn't perform any unexpected EOL translations
  on output.

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