exception "invalid AMQP data" thrown when using c++03 or newer

[NilsKintscher]

The functions Channel::CheckExchangeExists and Channel::CheckQueueExists both throw the following error when the library is linked to a c++ executable which is compiled with c++11 or newer.

terminate called after throwing an instance of 'AmqpClient::AmqpLibraryException'
  what():  invalid AMQP data

• The library SimpleAmqpClient itself was compiled with C++98
• I'm using g++10, boost 1.71.0 and rabbitmq-c is compiled with -DENABLE_SSL_SUPPORT=OFF

edit: The four unit tests regarding these two functions fail with this error when line 10 of CMakeLists.txt is changed, for example to set(CMAKE_CXX_STANDARD 20). It might have to do something with boost::string_ref (?)