First try at detecting CGAL more robustly. #13669
Merged
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First step towards #13668.
This is still not perfect. I'm waiting for feedback from @tamiko.
However, it should now work on our CI testers, and it works on all machines I have. I'm not sure if boost libraries are included correctly, and there may be issues with some of them, but so far this is ok, since we are not yet using anything fancy from CGAL that requires boost stuff we don't already include.
Merging this makes sure that at least we check if the compilation of the library with CGAL support succeeds.