avoid adding Paho MQTT C library twice #350
Merged
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If a library is included that itself uses the Paho MQTT C++ it is not possible to add Paho MQTT C++ a second time. This results in the following message
| add_library cannot create imported target "PahoMqttC::PahoMqttC" because
| another target with the same name already exists.
It is not always possible to avoid such scenario (e.g. if third party software is used), so it is better to prevent this error.