message: Fix to xcode 10.3 to avoid protoc error.
diff: @@ -20,4 +20,8 @@ echo "bazel clean --expunge" >> tensorflow/tools/ci_build/linux/libtensorflow.sh
  source tensorflow/tools/ci_build/release/common.sh
  update_bazel_macos
  +# Pick a version of xcode
  +export DEVELOPER_DIR=/Applications/Xcode_10.3.app/Contents/Developer
  +sudo xcode-select -s "${DEVELOPER_DIR}"
  +
  tensorflow/tools/ci_build/osx/libtensorflow_cpu.sh
  