liegroup: fix C++ version checking

9 jobs for pr/1305 in 155 minutes and 52 seconds (queued for 1 second)
Name Stage Failure
format Test
     case pinocchio::URDF:
- pinocchio::urdf::buildModel(filename,model,verbose);
+ pinocchio::urdf::buildModel(filename, model, verbose);
std::cerr << "It seems that the URDFDOM module has not been found during the Cmake process." << std::endl;
Cleaning up file based variables
ERROR: Job failed: exit code 1