travis: enable more archs during cron build
Enable builds on ppc64le on our daily build. s390x will follow at some
later point (once all quirks are resolved).
As we also use the Linux native build from Travis for Codecov we start
to handle meson options based on builds here as well.
Reviewed-by: Marcel Hollerbach <firstname.lastname@example.org>
Differential Revision: https://phab.enlightenment.org/D11586