scripts/travis-ci: use our own (Fastly-fronted) mirror of pkg.mxe.info.
scripts/travis-ci: use our own (Fastly-fronted) mirror of pkg.mxe.info.

Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble