chore: ensure we don't try to compile any C++ code #16
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We don't have any C++ code in this repo, and want to make sure that our examples don't transitively depend on building protoc from source.
#13 should have been red due to the issue I fixed in protocolbuffers/protobuf#17078
This change ensures that PR and any others that regress will be caught by CI.
It should be the case that users with a broken or non-hermetic CC toolchain are still able to work with Protocol Buffers.