One more cmake update

CMakeLists.txt

@@ -46,6 +46,11 @@ string(REPLACE "/W3" "/Wall" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
 string(REPLACE "/W3" "/Wall" CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG})
 string(REPLACE "/W3" "/Wall" CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE})
 
+# Not using typeid or dynamic_cast, so disable RTTI to save binary size
+string(REPLACE "/GR" "/GR-" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
+string(REPLACE "/GR" "/GR-" CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG})
+string(REPLACE "/GR" "/GR-" CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE})
+
 add_executable(meshconvert
     meshconvert/meshconvert.cpp
     meshconvert/MeshOBJ.cpp