Use wiringPi with Plug

I need to call wiringPi functions from Plug source code.
So I wasted some time editing Plug's CMakefile to be able to compile Plug source together wiringPi calls.
I also found a bug in the cmake version I was using. This bug didn't allow to compile multiple source files stored in different folders. I had Plug code in its folder and wiringPi files somewhere in file system. As workaround I did edit CMakefile and set version as 3.13.0.



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