Removed redundant call to make in grpc_*_base Dockerfiles

tools/dockerfile/grpc_node/Dockerfile

@@ -7,7 +7,6 @@ RUN cd /var/local/git/grpc \
   && git submodule update --init --recursive
 
 # Install the C core.
-RUN make clean -C /var/local/git/grpc
 RUN make install_c -C /var/local/git/grpc
 
 RUN cd /var/local/git/grpc/src/node && npm install && node-gyp rebuild

tools/dockerfile/grpc_node_base/Dockerfile

@@ -15,8 +15,5 @@ RUN cd /var/local/git/grpc && \
   git pull --recurse-submodules && \
   git submodule update --init --recursive
 
-# Build the C core
-RUN make static_c shared_c -j12 -C /var/local/git/grpc
-
 # Define the default command.
 CMD ["bash"]
\ No newline at end of file

tools/dockerfile/grpc_php/Dockerfile

@@ -5,7 +5,6 @@ RUN cd /var/local/git/grpc \
   && git pull --recurse-submodules \
   && git submodule update --init --recursive
 
-RUN make clean -C /var/local/git/grpc
 RUN make install_c -j12 -C /var/local/git/grpc
 
 RUN cd /var/local/git/grpc/src/php/ext/grpc && git pull && phpize

tools/dockerfile/grpc_php_base/Dockerfile

@@ -88,8 +88,5 @@ RUN wget https://phar.phpunit.de/phpunit.phar \
   && chmod +x phpunit.phar \
   && mv phpunit.phar /usr/local/bin/phpunit
 
-# Build the C core
-RUN make static_c shared_c -j12 -C /var/local/git/grpc
-
 # Define the default command.
 CMD ["bash"]

tools/dockerfile/grpc_ruby/Dockerfile

@@ -10,7 +10,6 @@ RUN cd /var/local/git/grpc \
 RUN touch /var/local/git/grpc/include/grpc/support/string.h
 
 # Build the C core.
-RUN make clean -C /var/local/git/grpc
 RUN make install_c -C /var/local/git/grpc
 
 # Build ruby gRPC and run its tests

tools/dockerfile/grpc_ruby_base/Dockerfile

@@ -53,6 +53,3 @@ RUN cd /var/local/git/grpc/third_party/protobuf && \
   ./autogen.sh && \
   ./configure --prefix=/usr && \
   make -j12 && make check && make install && make clean
-
-# Build the C core
-RUN make static_c shared_c -j12 -C /var/local/git/grpc