Warning on no matching class member

[albert-github]

The overnight documentation build gives a warning (with the doxygen master version):

/home/cgal-testsuite/cgal_doc_build/CGAL-6.2-Ic-24/include/CGAL/Frechet_distance/Neighbor_search.h:106: warning: no matching class member found for
  template < PointRange, Traits >
  std::vector< std::size_t > CGAL::Frechet_distance::Neighbor_search< PointRange, Traits >::get_close_curves(const PointRange &curve, double distance, Sequential_tag) ->std::vector< std::size_t >
Possible candidates:
  'template < ConcurrencyTag >
  std::vector< std::size_t > CGAL::Frechet_distance::Neighbor_search< PointRange, Traits >::get_close_curves(const PointRange &query, double distance)' at line 79 of file /home/cgal-testsuite/cgal_doc_build/CGAL-6.2-Ic-24/include/CGAL/Frechet_distance/Neighbor_search.h
  'std::vector< std::size_t > CGAL::Frechet_distance::Neighbor_search< PointRange, Traits >::get_close_curves(const PointRange &query, double distance, Sequential_tag)' at line 90 of file /home/cgal-testsuite/cgal_doc_build/CGAL-6.2-Ic-24/include/CGAL/Frechet_distance/Neighbor_search.h

In principle the code is correct but due to the double usage of std::vector< std::size_t > doxygen has a small problem (since the integration of the fix for https://github.com/doxygen/doxygen/issues/11787). The workaround as used by CGAL is not necessary.

(tested documentation against doxygen master version and dixygen 1.9.6)

[albert-github]

Doxygen master version does not throw a warning anymore as a patch https://github.com/doxygen/doxygen/commit/1de51f9212467447d2ae96949f0ea7ce3e124eb2 has been made. The DOXYGEN_RUNNING construct is not necessary (as far as I can tell), so it would anyway be good to apply this proposed pull request (at least when there are no failing tests)