Partial revert of merge from 'feat/MoveToModernCMake', which prevents using ROS (using PCL 1.8).
Previous merge from 'feat/MoveToModernCMake' used PCL 1.9, which is incompatible with ROS (which comes with PCL 1.8).
Previous merge from 'feat/MoveToModernCMake' used PCL 1.9, which is incompatible with ROS (which comes with PCL 1.8).