Simplify one of the Travis build cases to reduce build time
Simplify one of the Travis build cases to reduce build time

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