message: Remove no longer necessary packages from Dockerfile.
diff: @@ -34,7 +34,7 @@ ENV DEBIAN_FRONTEND noninteractive
  # Package installation
  RUN apt-get update
  ## Common packages for linux build environment
  -RUN apt-get install -y clang libc++-dev libc++abi-dev python python-six python3-six pkg-config git curl bzip2 unzip make ninja-build
  +RUN apt-get install -y clang libc++-dev libc++abi-dev python pkg-config git curl bzip2 unzip make ninja-build
  ## Packages for linux desktop version
  RUN apt-get install -y libibus-1.0-dev libglib2.0-dev qtbase5-dev libgtk2.0-dev libxcb-xfixes0-dev
  ## Packages for misc tools
  