Fix some warnings when using latest CMake and Python unit
Fix some warnings when using latest CMake and Python unit

amelmquist/chrono,PedroTrujilloV/chrono,hsu/chrono,andrewseidl/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,PedroTrujilloV/chrono,amelmquist/chrono,projectchrono/chrono,Bryan-Peterson/chrono,armanpazouki/chrono,Bryan-Peterson/chrono,Milad-Rakhsha/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,andrewseidl/chrono,PedroTrujilloV/chrono,tjolsen/chrono,armanpazouki/chrono,rserban/chrono,armanpazouki/chrono,Bryan-Peterson/chrono,jcmadsen/chrono,rserban/chrono,jcmadsen/chrono,andrewseidl/chrono,jcmadsen/chrono,amelmquist/chrono,jcmadsen/chrono,rserban/chrono,rserban/chrono,rserban/chrono,amelmquist/chrono,Bryan-Peterson/chrono,dariomangoni/chrono,tjolsen/chrono,tjolsen/chrono,dariomangoni/chrono,projectchrono/chrono,PedroTrujilloV/chrono,PedroTrujilloV/chrono,Milad-Rakhsha/chrono,rserban/chrono,jcmadsen/chrono,jcmadsen/chrono,dariomangoni/chrono,armanpazouki/chrono,dariomangoni/chrono,Bryan-Peterson/chrono,rserban/chrono,hsu/chrono,hsu/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,hsu/chrono,projectchrono/chrono,andrewseidl/chrono,armanpazouki/chrono,amelmquist/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,amelmquist/chrono,tjolsen/chrono,armanpazouki/chrono,hsu/chrono,tjolsen/chrono,projectchrono/chrono,jcmadsen/chrono,andrewseidl/chrono