Merge pull request #4700 from ethereum/cpp-build-env

cpp-build-env: Install make

Author: chfast

scripts/docker/cpp-build-env.dockerfile

@@ -25,6 +25,7 @@ RUN export DEBIAN_FRONTEND=noninteractive \
     git \
     ssh-client \
     cmake \
+    make \
     ninja-build \
     python-pip \
     python-requests \