message: Update makefile build to be OK with bazel mirror URLs.
diff: @@ -20,11 +20,11 @@ DOWNLOADS_DIR=tensorflow/contrib/makefile/downloads
  BZL_FILE_PATH=tensorflow/workspace.bzl
  EIGEN_URL="$(grep -o 'http.*bitbucket.org/eigen/eigen/get/.*tar\.gz' "${BZL_FILE_PATH}" | grep -v bazel-mirror | head -n1)"
  -GEMMLOWP_URL="$(grep -o 'http.*github.com/google/gemmlowp/.*tar\.gz' "${BZL_FILE_PATH}" | grep -v bazel-mirror | head -n1)"
  +GEMMLOWP_URL="$(grep -o 'http://mirror.bazel.build/github.com/google/gemmlowp/.*tar\.gz' "${BZL_FILE_PATH}" | head -n1)"
  GOOGLETEST_URL="https://github.com/google/googletest/archive/release-1.8.0.tar.gz"
  -NSYNC_URL="$(grep -o 'http.*github.com/google/nsync/.*tar\.gz' "${BZL_FILE_PATH}" | grep -v bazel-mirror | head -n1)"
  -PROTOBUF_URL="$(grep -o 'http.*github.com/google/protobuf/.*tar\.gz' "${BZL_FILE_PATH}" | grep -v bazel-mirror | head -n1)"
  -RE2_URL="$(grep -o 'http.*github.com/google/re2/.*tar\.gz' "${BZL_FILE_PATH}" | grep -v bazel-mirror | head -n1)"
  +NSYNC_URL="$(grep -o 'http://mirror.bazel.build/github.com/google/nsync/.*tar\.gz' "${BZL_FILE_PATH}" | head -n1)"
  +PROTOBUF_URL="$(grep -o 'http://mirror.bazel.build/github.com/google/protobuf/.*tar\.gz' "${BZL_FILE_PATH}" | head -n1)"
  +RE2_URL="$(grep -o 'http://mirror.bazel.build/github.com/google/re2/.*tar\.gz' "${BZL_FILE_PATH}" | head -n1)"
  FFT2D_URL="$(grep -o 'http.*fft\.tgz' "${BZL_FILE_PATH}" | grep -v bazel-mirror | head -n1)"
  # TODO(petewarden): Some new code in Eigen triggers a clang bug with iOS arm64,
  