demo/postprocess: explicitly cast string as char*
demo/postprocess: explicitly cast string as char*

Conversion from string literal to char* has been deprecated

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