Build base archives for CI in a separate repository

[Ryan Schmidt]

On Jul 26, 2017, at 11:19, Clemens Lang wrote:

> For example, we could upload a generated archive to Bintray and update a
> file that always contains the URL to the latest archive and just download
> that in the Travis CI job.
> 

If we want to use BinTray for any MacPorts things, I already registered the "macports" organization there.