Commit 92fd5675 authored by Jehan's avatar Jehan

gitlab-ci: enabling make check on master CI.

Also install missing xauth (required by xvfb-run).
`make check` was broken on CI, but got fixed by commits 707d3c6f,
f6e9c6ee, 2c1efded and of course the present one.
parent 2c1efded
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