message: fix glvis include install
diff: @@ -15,7 +15,7 @@ popd
  # include xeus-glvis
  git clone https://github.com/GLVis/xeus-glvis.git
  pushd xeus-glvis
  -glvis_dir=$install_dir/glvis
  +glvis_dir=$install_dir/include/glvis
  mkdir -p $glvis_dir
  cp include/xglvis.hpp $glvis_dir
  popd
  