replaced static tutorial_shared_path string with #define

Former-commit-id: bd37fbf7c1

tutorial/101_FileIO/main.cpp

@@ -9,7 +9,7 @@ Eigen::MatrixXi F;
 int main(int argc, char *argv[])
 {
   // Load a mesh in OFF format
-  igl::readOFF(tutorial_shared_path + "/cube.off", V, F);
+  igl::readOFF(TUTORIAL_SHARED_PATH  "/cube.off", V, F);
 
   // Print the vertices and faces matrices
   std::cout << "Vertices: " << std::endl << V << std::endl;