Draft: CMake: Add an option to control usage of PTHREAD API

@m214003 I suppose this should be set in the Makefile too ? Can you point me the right way to do it ?

My changes are pending. The whole CMake stuff was bad and I reworked it over the last few weeks. Please wait until M300433/cmake improvements and define cleanups is merged. Uwe is usually quite quick with these things.

alright, ill wait.

I think we are ready, please send us all your CMake updates that you need in the next CDI release.

I'm working on it right now, I should be able to provide a branch by the end of the week.

Here is my CMake branch: !134 (merged)

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