Merge "Uprev protobuf build rules to match v29.0" into main
This repository contains GN build system support for Protocol Buffers. It's in its own repository because it needs to be shared by Fuchsia and Cobalt.
This repo should be checked out such that:
//build/secondary/third_party/protobuf.//third_party/protobuf.//.gn contains secondary_source = "//build/secondary/"See the GN documentation on secondary_source.