srajmane

Add s390x support for travis.

1

As Travis CI [officially supports](https://blog.travis-ci.com/2019-11-12-multi-cpu-architecture-ibm-power-ibm-z) s390x builds, adding support for same.

[INFRA-23217] : s390x Jenkinsfile

2

- [ ] [JIRA issue](https://issues.apache.org/jira/browse/INFRA-23217) Adding support for IBM Z (s390x) into Apache Maven Jenkins CI. s390x nodes are already available: https://jenkins-ccos.apache.org/view/all/

Add s390x xplatform-build

6

This PR adds s390x arch for xplatform-build.

Is there any documentation to build dugite-native from source?