67659ab1eb
This is still poorly documented by Travis but according to: https://docs.travis-ci.com/user/common-build-problems/#Running-a-Container-Based-Docker-Image-Locally their reference images are now hosted on Docker Hub. So we update the FROM line to refer to the new default image. We also need a few additional tweaks: - re-enable deb-src lines for our build-dep install - add explicit PATH definition for tools - force the build USER to be Travis - add clang to FEATURES for our test-clang machinery Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>