Andreas Rammhold bf956dfbe3 Fix build with CGAL 5.6 (again) (#6439) ...

* Fix build with CGAL 5.6

Surface_mesh iterators no longer return references, so it's necessary to
use const references or copies when iterating.

This was previously merged in #3045 but isn't references in the
current main branch anymore. No idea where why it is gone, but the issue
still persists thus the patch should still be added.

2024-08-18 11:34:15 +08:00

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