The master copy of calculate_edges() lives nowadays in gl-renderer.c.
Copy it verbatim from gl-renderer.c into cliptest.c.
Update cliptest.c for the following changes that happened in Weston
core, vertex.clipping.c, and gl-renderer.c:
- replace GLfloat with float
- introduction of weston_view, here replacing weston_surface
- API change of weston_view_to_global_float
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
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