Fix xcopy so output is either unicode (console) or oem (file)

[Kirill K. Smirnov]

> "Kirill K. Smirnov" <lich at math.spbu.ru> wrote:
> > A question: what make you think that WriteConsole uses current console
> > output code page to translate strings?
>
> The written strings in 866 and 1251 code pages are only readable
> when output console code page matches the string encoding.
This is in wine.
In windows only cp866 is readable regardless of ConsoleOutputCP.