Bug#904262: python-fabio builds for the default python3 version, but tests with all supported versions.

[Matthias Klose]

Package: src:python-fabio
Version: 0.6.0+dfsg-1
Severity: serious
Tags: sid buster

python-fabio builds for the default python3 version, but tests with all
supported versions, not finding the extensions for the non-default version.