sixtracklib: make use of variadic macros in namespace API dependent on NOT defined( _GPUCODE) -> not all openCL compilers support them
sixtracklib: make use of variadic macros in namespace API dependent on NOT defined( _GPUCODE) -> not all openCL compilers support them

SixTrack/SixTrackLib,SixTrack/SixTrackLib,SixTrack/SixTrackLib,SixTrack/SixTrackLib