gh-55258: Reenable support test_get_original_stdout()

[vstinner]

• Issue: add tests for test.support #55258

[vstinner]

The test is skipped since 2011, since commit 7cd94a1:

commit 7cd94a1e232b3af6ab6df363336907fc4bce53f6
Author: Eli Bendersky <eliben@gmail.com>
Date:   Sat Jul 23 15:00:31 2011 +0300

    Issue #11049: skip a test that fails on some buildbots

See the buildbot failure: https://bugs.python.org/issue11049#msg140934

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @vstinner for commit 2dff5cd 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F139499%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

[vstinner]

Oh ok, the test fails (on buildbots) when the --junit-xml option is used:

FAIL: test_get_original_stdout (test.test_support.TestSupport.test_get_original_stdout)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildbot/buildarea/pull_request.itamaro-centos-aws.nogil/build/Lib/test/test_support.py", line 100, in test_get_original_stdout
    self.assertEqual(support.get_original_stdout(), sys.stdout)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: <_io.TextIOWrapper name='<stdout>' mode='w' encoding='utf-8'> != <_io.StringIO object at 0x200018a4c90>

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @vstinner for commit e2e6a8c 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F139499%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.