windows: do not replace sys.__stdout__ Now we don't use sys.__stdout__ except for getting its fileno(), so we no longer have to wrap it by winstdout. This helps adding pycompat.stdin/out/err.

py3: update test-check-py3-compat.t output This part remains unchanged because it runs in Python 3 only.

py3: use pycompat.sysargv in dispatch.run() Another one to have a bytes result from sys.argv in Python 3. This one is also a part of running `hg version` on Python 3.