[master] 1b606ff94 ci: Increase parallelism in Travis CI builds

[Poul-Henning Kamp]

--------
Dridi Boukelmoune writes:

> https://docs.travis-ci.com/user/reference/overview/#which-one-do-i-use
>
> Except for the macos and sanitizer jobs, we could run "normal" jobs in
> aarch64, ppc64le and s390x containers with a faster spin up, but
> possibly slower execution speed (at least that's how aarch64 looks
> today).
>
> Thoughts?

The more the merrier.

ARM64 is going to be much more important now that Amazon rolled it out
and Apple ships laptops with it.

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