kjellander 292e192f17 Add build_protobuf variable.
This makes it possible to use protobuffers with
an external protobuf library instead of the one that
comes with the WebRTC code.

NOTRY=True

Review URL: https://codereview.webrtc.org/1589433002

Cr-Commit-Position: refs/heads/master@{#11236}
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