We install docker-compose from pypi in order to get newer features
(particularly useful for gerrit). On x86 all the deps for this have
wheels and we don't need build deps but on arm64 wheels don't exist for
things like cffi. Add build-essential, python3-dev, libffi-dev, and
libssl-dev to ensure we can build the necessary deps to install
docker-compose on arm64.
Change-Id: Id9c61dc904d34d2f7cbe17c70ad736a9562bb923
3966bcdf4e