Fix stdout encoding for python2 and python3 in test262-harness.py

[lygstate]

Traceback (most recent call last):
  File "C:\work\study\languages\typescript\jerryscript\tools\runners\test262-harness.py", line 1019, in <module>
    sys.exit(main())
  File "C:\work\study\languages\typescript\jerryscript\tools\runners\test262-harness.py", line 1009, in main
    code = test_suite.run(options.command, args,
  File "C:\work\study\languages\typescript\jerryscript\tools\runners\test262-harness.py", line 930, in run
    progress.has_run(result)
  File "C:\work\study\languages\typescript\jerryscript\tools\runners\test262-harness.py", line 753, in has_run
    result.report_outcome(True)
  File "C:\work\study\languages\typescript\jerryscript\tools\runners\test262-harness.py", line 492, in report_outcome
    self.write_output(sys.stdout)
  File "C:\work\study\languages\typescript\jerryscript\tools\runners\test262-harness.py", line 506, in write_output
    target.write("--- errors ---  \n %s" % error)
UnicodeEncodeError: 'gbk' codec can't encode character '\xab' in position 52: illegal multibyte sequence
...............................................=== Summary - updating excludelist ===

JerryScript-DCO-1.0-Signed-off-by: Yonggang Luo luoyonggang@gmail.com

[akosthekiss]

If suggestion given at #4390 (review) is applied (i.e., target is opened with a proper encoding), then this change (i.e., wrapping the write into a function) may not even be needed. Please, check and confirm.

[lygstate]

If suggestion given at #4390 (review) is applied (i.e., target is opened with a proper encoding), then this change (i.e., wrapping the write into a function) may not even be needed. Please, check and confirm.

Does codecs possible to open stdout/stderr?
Because this target is file or stdout

[akosthekiss]

Stdout or stderr cannot/shouldn't be re-opened, but codecs could still help. Stdout and stderr can be wrapped at the start of the program with something like:

(out_stream, err_stream) = (sys.stdout.buffer, sys.stderr.buffer) if sys.version_info.major >= 3 else (sys.stdout, sys.stderr)

if sys.stdout.encoding != 'UTF-8':
    sys.stdout = codecs.getwriter('utf-8')(out_stream, 'ignore')
if sys.stderr.encoding != 'UTF-8':
    sys.stderr = codecs.getwriter('utf-8')(err_stream, 'ignore')

(disclaimer: untested)