message: integration_tests: allow using deprecated APIs
  This is supposed to be temporary.
diff: @@ -7,6 +7,10 @@ include_directories(
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DTESTING")
  +add_compile_options(
  + -Wno-error=deprecated-declarations
  +)
  +
  # `make test` does not show output, but `make check` does
  add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} --verbose)
  