stdout shouldn't modify binary data on Windows

[nex3]

Currently on Windows, if a List<int> is passed to stdout.add (or stderr.add), any instance of the byte 0xA (an ASCII newline) is replaced by the sequence 0xD 0xA (an ASCII carriage return followed by an ASCII newline). This means that any pure binary data emitted via stdout will be corrupted on Windows. Even when not emitting pure binary data, a subprocess that emits its own \r\n sequences will have an extra \r added if its stdout is piped to the host process's stdout.

[nex3]

Here's a repro:

    // inner.dart
    import 'dart:io';

    void main() {
      stdout.add(["\n".runes.single]);
    }

    // outer.dart
    import 'dart:io';

    void main() {
      var result = Process.runSync(Platform.executable, ["inner.dart"],
          stdoutEncoding: null);
      print(result.stdout);
    }

When run on Linux, this prints "[10]". On Windows, it prints "[13, 10]".

[DartBot]

This comment was originally written by @Fox32

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The same as issue #19334 and issue #22471?

[nex3]

Added Duplicate label.
Marked as being merged into #19334.