Add "setBinaryMode" and "setTextMode" to stdio?

[Johan Engelen via Digitalmars-d]

Hi all,
  To fix EOL writing with "dfmt ---> stdout" on Windows, stdout 
has to be set to binary mode [1]. The code for this is 
non-trivial, and some DMD internal magic is needed:

version(Windows)
{
    // See Phobos' stdio.File.rawWrite
    {
        import std.stdio;
        immutable fd = fileno(stdout.getFP());
        setmode(fd, _O_BINARY);
        version(CRuntime_DigitalMars)
        {
            import core.atomic : atomicOp;
            atomicOp!"&="(__fhnd_info[fd], ~FHND_TEXT);
        }
    }
}

I think it'd be very nice to have stdio.File.setBinaryMode() and 
stdio.File.setTextMode().
In dfmt's case, rawWrite is not available because 
stdout.lockingTextWriter() is used, which only has put().

Should I work on a PR for setBinaryMode+setTextMode ?

thanks,
  Johan