protoc-artifacts: Avoid checking out protobuf code

It is a bad idea to check out code into the docker image, as it will be
out-of-date. It is better to have the image just be the environment, and
let any scripts that need source check them out themselves.

This fixes #4419 in that it allows the image to build again, albeit
users would need to use wget to grab the source of the version of
protobuf they wish.

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