[Gmsh] orient ruled surfaces

[Antonio Cervone]

Hello,
when trying to use gmsh library API, I was not able to create ruled
surfaces when the edges are not properly oriented. At this link

https://gist.github.com/capitalaslash/47c04578b8d34f42df5ff892b577b5be

you can see an example that fails without the patch attached there. Is it
the correct way to do it?
Thanks,

Antonio
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