[opus] Misc patches

[Emily Bowman]

The current CI script just checks if the build succeeds or fails against
each PR/commit, this change enables it to also run tests and report the
result.

On Thu, Jun 11, 2020 at 12:50 AM Jean-Marc Valin <jmvalin at jmvalin.ca> wrote:

> For patch 1, can you explain a bit more what it does (to
> someone familiar with neither cmake nor gitlab-ci).
>
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