[issue31370] Remove support for threads-less builds

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Following lines needs updating:

Lib/importlib/_bootstrap.py:1135
Lib/_pydecimal.py:436
Lib/test/ssl_servers.py:11
Lib/test/support/__init__.py:2053
Lib/test/test_httplib.py:1080
Lib/test/test_idle.py:4
Lib/test/test_multiprocessing_main_handling.py:3
Lib/test/test_thread.py:5
Lib/test/test_threadsignals.py:8
Lib/test/test_tools/test_sundry.py:43
Lib/test/test_winreg.py:7
Lib/test/test_wsgiref.py:256
Lib/test/test_xmlrpc.py:1179

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31370>
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