ci: Enable -Werror in more clover builds.

We've slowly been pushing -Werror through the set of CI builds, and it
looks like clover is clean at the moment.  Keep it that way.

Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Acked-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7664>
1 file changed