don't launch gui

tutorial/c++/t11.cpp

@@ -53,7 +53,6 @@ int main(int argc, char **argv)
   // gmsh::option::setNumber("Mesh.RecombinationAlgorithm", 2); // or 3
   // gmsh::model::mesh::generate(2);
 
-  gmsh::fltk::run();
   gmsh::finalize();
   return 0;
 }

tutorial/c++/t12.cpp

@@ -53,8 +53,6 @@ int main(int argc, char **argv)
   // set compound surface from surfaces 1, 5, 10
   gmsh::model::mesh::setCompound(2, {1, 5, 10});
 
-  gmsh::fltk::run();
-
   gmsh::finalize();
 
   return 0;

tutorial/c++/t13.cpp

@@ -62,8 +62,6 @@ int main(int argc, char **argv)
 
   gmsh::model::mesh::generate(3);
 
-  gmsh::fltk::run();
-
   gmsh::finalize();
   return 0;
 }