Fix acronym with portable example solution for CI.

[guygastineau]

With this new portable example solution for acronym it can be included in the ci tests, so that all non-deprecated exercises are tested in the ci tests.

[kytrinyx]

@guygastineau Thank you for taking the time to fix this. I'm not sure why nobody has responded yet. I've pinged the team and if we don't hear back in a couple of days I'm going to go ahead and merge this.