message: Fix nested namespace usage
  Nested namespaces require C++17
diff: @@ -15,6 +15,8 @@ limitations under the License.
  #include "tensorflow/compiler/mlir/tensorflow/ir/tf_op_interfaces.h"
  -namespace mlir::TF {
  +namespace mlir {
  +namespace TF {
  #include "tensorflow/compiler/mlir/tensorflow/ir/tf_op_interfaces.cc.inc"
  -} // namespace mlir::TF
  +} // namespace TF
  +} // namespace mlir
  