.travis.yml: Drop s390x temporarily.
The s390x pipeline is unstable with the error "No output has been received" or doesn't start. See https://travis-ci.community/t/13811.
.travis.yml: Drop s390x temporarily.
The s390x pipeline is unstable with the error "No output has been received"
or doesn't start. See https://travis-ci.community/t/13811.