Do not set CH_IRRLICHT_SDKDIR if using Linux or Darwin
Do not set CH_IRRLICHT_SDKDIR if using Linux or Darwin

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