Export targets that just used from external repositories

So far, we did not export ["@", "grpc", "", "grpc++_codegen_proto"]
and ["@", "grpc", "src/compiler", "grpc_cpp_plugin"]. Those targets
where used implicitly in the generation of protobuf. As flexible
config we use all variables those targets currently depend upon.
This will have to be extended once cross compilation will be
added. So far, the "TARGET_ARCH" is only used by targets that have
different source files (typically inline assembly) for different
target architectures. With cross compilation, also the tool chain
will depend on the target architecture.

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