Have make also fail if Python script fails. (#412)
Have make also fail if Python script fails. (#412)

* Have make also fail if Python script fails.

BUG=http://b/196630709

* debugging error.

* support versions of make < 4.2

* replace some tabs with spaces.
tensorflow/tflite-micro,tensorflow/tflite-micro,tensorflow/tflite-micro,tensorflow/tflite-micro