Warnings while compiling the source for grpc Release v1.18.0

[solodynamo]

What version of protobuf and what language are you using? Using grpc Release v1.18.0 for golang and php

What operating system (Linux, Windows, ...) and version? Linux 3.16.0-4-amd64 SMP Debian 3.16.7-ckt25-2+deb8u3 (2016-07-02) x86_64 GNU/Linux

What did you do?

1. RUN command in Dockerfile

   RUN git clone --recursive --depth=1 -b v1.18.0 https://github.com/grpc/grpc.git /grpc && \
    ln -s /grpc/third_party/protobuf /protobuf && \
    cd /protobuf && \
    ./autogen.sh && \
    ./configure --prefix=/usr --enable-static=no && \
    make && \
    make check && \
    make install && \
    make install DESTDIR=/out && \
    cd /grpc && \
    make install-plugins prefix=/out/usr

Steps to reproduce the behaviour: Run the above in a Dockerfile

What did you expect to see No dead code warning like those.

What did you see instead? Warning logs. PFA

[solodynamo]

Made a PR for removing dead code. #5773

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