requesting backport of PR19225.

After switching my bot to xlc-v13 it fails this test.

See botstatus mail excerpt:

The Buildbot has detected a failed build on builder POWER6 AIX 3.8 while building python/cpython.
Full details are available at:
    https://buildbot.python.org/all/#builders/181/builds/216

Buildbot URL: https://buildbot.python.org/all/

Worker for this Build: aixtools-aix-power6

Build Reason: <unknown>
Blamelist: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>

BUILD FAILED: failed test (failure)


Summary of the results of the build (if available):
===================================================

== Tests result: FAILURE then FAILURE ==

404 tests OK.

10 slowest tests:
- test_multiprocessing_spawn: 2 min 49 sec
- test_concurrent_futures: 2 min 46 sec
- test_bufio: 2 min 18 sec
- test_subprocess: 2 min 4 sec
- test_tokenize: 1 min 43 sec
- test_multiprocessing_forkserver: 1 min 41 sec
- test_tools: 1 min 39 sec
- test_pathlib: 1 min 35 sec
- test_multiprocessing_fork: 1 min 31 sec
- test_ssl: 1 min 23 sec

1 test failed:
    test_distutils