message: Add cleartext_keyset_handle back to the CMake 'cc' library rule.
diff: @@ -34,6 +34,7 @@ tink_cc_library(
  binary_keyset_reader.h
  binary_keyset_writer.h
  catalogue.h
  + cleartext_keyset_handle.h
  config.h
  deterministic_aead.h
  deterministic_aead_config.h
  @@ -78,6 +79,7 @@ tink_cc_library(
  tink::core::aead
  tink::core::binary_keyset_reader
  tink::core::binary_keyset_writer
  + tink::core::cleartext_keyset_handle
  tink::core::deterministic_aead
  tink::core::hybrid_decrypt
  tink::core::hybrid_encrypt
  