[issue38991] Remove test.support.strip_python_stderr()

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> do we have any buildbots using -X showrefcount?

No. What would be the purpose of such buildbot?

-X showrefcount is tested by test_cmd_line.test_showrefcount().

I ran "./python -X showrefcount -m test -j0 -r": all tests pass. (test_pty fail when run in parallel, but pass when run sequentially: bpo-38547, it's unrelated to this change).

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<https://bugs.python.org/issue38991>
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