This unbreaks the build by updating to a newer version, adding new
dependencies and backporting some patches.
0.9 is released already, but that version is no longer compatible with
tf1. 0.8.0 is compatible with tf1 and tf2.
Fixes the tensorflow-probability built by first building the wheel with
bazel. This actually creates the dist-info folder, allowing the package
to be picked up as a pip dependency.
