message: Add the streaming_aead_test_util_test to CMake.
  This was forgotten in a previous cl.
diff: @@ -585,10 +585,10 @@ tink_cc_library(
  DEPS
  absl::strings
  tink::core::streaming_aead
  - tink::util::test_util
  tink::util::ostream_output_stream
  tink::util::istream_input_stream
  tink::util::status
  + tink::subtle::test_util
  )
  # tests
  @@ -1021,3 +1021,13 @@ tink_cc_test(
  absl::memory
  absl::strings
  )
  +
  +tink_cc_test(
  + NAME streaming_aead_test_util_test
  + SRCS streaming_aead_test_util_test.cc
  + DEPS
  + tink::subtle::streaming_aead_test_util
  + tink::util::test_matchers
  + tink::util::test_util
  + gmock
  +)
  