Bug#962197: buildstream: Event loop broken on Python 3.8

[Ben Hutchings]

Control: tag -1 upstream fixed-upstream patch

Although there are still some issues with 3.8 upstream, this one is
actually fixed.  Here's the patch.

Ben.

-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom
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