MinGW CI: fix tests
Submitted by Christoph Reiter @creiter
Link to original bug (#795569)
Description
With bug 793729 we now run tests on each commit under MSYS2, see https://gitlab.gnome.org/GNOME/glib/-/jobs/27013 as an example
OK: 104 FAIL: 15 SKIP: 1 TIMEOUT: 5
We should
- Fix the tests
- Make failing tests fatal and make the error logs downloadable (and/or print them directly with --print-errorlogs)