message: ci: build external deps with BUILD_DISTINCT=1.
  This is needed for it's going to temporarily increase the CI image size, but this will go away
  when we remove the need for cmake.
diff: @@ -33,4 +33,10 @@ export CXX=g++-4.9
  export THIRDPARTY_DEPS=/tmp
  export THIRDPARTY_SRC=/thirdparty
  export THIRDPARTY_BUILD=/thirdparty_build
  +# TODO(htuch): Remove the first build of the libraries in non-distinct locations when cmake is gone.
  +# Below we now build/install twice and this requires 2x the space in the Docker image as is to
  +# support both Bazel and cmake, but it's not worth fixing up all the cmake stuff since it's going
  +# soon.
  "$(dirname "$0")"/build_and_install_deps.sh
  +rm -f /tmp/*.dep
  +BUILD_DISTINCT=1 "$(dirname "$0")"/build_and_install_deps.sh
  