small change to include irrlicht include directory automatically
small change to include irrlicht include directory automatically

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