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fixed PR to build with qmake-qt4 again

after analysis: rabbitmq-3.6.14 shows different behavior in tune() than current rabbitmq:3-latest docker container (3.8.0) used locally. The fixed unit test works with 3.8.0, but not with Travis 3.6.14. I will...

Visual Studio stores them under "Additional Options" 

I'm running the latest version of the addin - and can confirm, that it works, as long as the `struct` is not using any Qt types