Fix issue in core Chrono CMakeLists were linking the OpenMP libraries was removed in one of the many recent merges
Fix issue in core Chrono CMakeLists were linking the OpenMP libraries was removed in one of the many recent merges

Milad-Rakhsha/chrono,dariomangoni/chrono,projectchrono/chrono,dariomangoni/chrono,dariomangoni/chrono,rserban/chrono,projectchrono/chrono,rserban/chrono,dariomangoni/chrono,rserban/chrono,rserban/chrono,Milad-Rakhsha/chrono,rserban/chrono,rserban/chrono,projectchrono/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,Milad-Rakhsha/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,dariomangoni/chrono,rserban/chrono