message: Fix an include-what-you-use violation: include interpreter_builder.h
  from delegate_test.cc, for InterpreterBuilder.
diff: @@ -21,6 +21,7 @@ limitations under the License.
  #include <gtest/gtest.h>
  #include "tensorflow/lite/delegates/interpreter_utils.h"
  #include "tensorflow/lite/interpreter.h"
  +#include "tensorflow/lite/interpreter_builder.h"
  #include "tensorflow/lite/kernels/internal/compatibility.h"
  #include "tensorflow/lite/kernels/kernel_util.h"
  #include "tensorflow/lite/kernels/register.h"
  