Drop Orbital Explorer shader.
The upstream version of Orbital Explorer doesn't run on Mesa drivers, as it (unnecessarily) requests a compatibility profile on non-Apple OSes, and suffers from GLEW bugs. I sent a pull request two years ago to port it to libepoxy and get it running on Mesa drivers, but it was never accepted. The author eventually emailed me and said that he considers it a "finished experiment" and said the rendering method (geometry shader based approach) is inefficient, and he intends to fully rewrite it someday. Since this is not representative of typical geometry shaders, and the project is effectively dead, we may as well remove it. Reviewed-by: Chad Versace <email@example.com>
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