travis-ci: add arm64, s390x builds.

travis-ci: add arm64, s390x builds.

as described on https://docs.travis-ci.com/user/multi-cpu-architectures
travis-ci
now supports amd64, ppcle, arm64, s390 architectures. Add arm64 and s390x.

travis-ci images were upgraded to bionic.

"sudo" is deprecated, let us remove it, also "matrix" is deprecated in
favour of "jobs".

LD_LIBRARY_PATH was replaced by using "rpath" in LDFLAGS, which is more
elegant way of linking.

also, dependencies were upgraded to the latest versions.

travis_wait was added for long openssl builds.

cmocka was added to linux and osx builds.
Acked-by: Lev Stipakov <lstipakov@gmail.com>
Message-Id: <20200322123521.17710-1-chipitsine@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg19574.html

Signed-off-by: Gert Doering <gert@greenie.muc.de>