behdad-glyphy: New trace of a GL2 SDF text renderer.

428k trace, nice license, I remember when its shader used to be
"hard".  First frame of the demo in commit
bc2da506d23bdaf3eb0d95c9649a4591b4d912c7 of
https://github.com/behdad/glyphy

Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <!15>
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