[3dprinter-general] Bug#917687: Bug#917687: cura-engine: FTBFS: ./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8: undefined reference to `pthread_create'

[Gregor Riepl]

>> I will look into the issue.
>> If you have any idea why it might be occurring, please share.
> 
> The actual error is in #917057, which was already correctly marked as 
> affecting src:cura-engine.

I'm positive that the problem is more complex than that, because I already
committed and tested the fix for #917057 and I still get an error.

That, or the fix wasn't enough.