[issue31370] Remove support for threads-less builds

[STINNER Victor]

STINNER Victor added the comment:

We had a buildbot testing --without-threads, but it's gone. I just removed its unused class from the buildbot configuration:

https://github.com/python/buildmaster-config/commit/091f52aa05a8977966796ba3ef4b8257bef1c0e9

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