message: Add c-ares 1.12.0 to Docker image
diff: @@ -4,7 +4,7 @@ set -e
  # Setup basic requirements and install them.
  apt-get update
  -apt-get install -y wget software-properties-common make cmake git python python-pip clang-format-3.6 bc
  +apt-get install -y wget software-properties-common make cmake git python python-pip clang-format-3.6 bc libtool automake
  apt-get install -y golang
  # For debugging.
  apt-get install -y gdb strace
  @@ -67,6 +67,16 @@ make install
  cd ..
  rm -fr nghttp2*
  +# c-ares
  +wget https://github.com/c-ares/c-ares/archive/cares-1_12_0.tar.gz
  +tar xf cares-1_12_0.tar.gz
  +cd c-ares-cares-1_12_0
  +./buildconf
  +./configure --prefix=$THIRDPARTY_BUILD --enable-shared=no --enable-lib-only
  +make install
  +cd ..
  +rm -fr cares* c-ares*
  +
  # protobuf
  wget https://github.com/google/protobuf/releases/download/v3.0.0/protobuf-cpp-3.0.0.tar.gz
  tar xf protobuf-cpp-3.0.0.tar.gz
  