Add workaround for finding the Irrlicht headers for a homebrew installation on Mac M1
Add workaround for finding the Irrlicht headers for a homebrew installation on Mac M1

dariomangoni/chrono,rserban/chrono,rserban/chrono,projectchrono/chrono,dariomangoni/chrono,dariomangoni/chrono,projectchrono/chrono,dariomangoni/chrono,rserban/chrono,rserban/chrono,dariomangoni/chrono,rserban/chrono,projectchrono/chrono,projectchrono/chrono,rserban/chrono,projectchrono/chrono,projectchrono/chrono,dariomangoni/chrono,rserban/chrono