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opengl/formats: fp16 textures are renderable in GLES 3.0 with GL_EXT_color_buffer_float

Hendrik Leppkes requested to merge h.leppkes/libplacebo:opengles-fp16 into master

The RPi4 only exposes GL_EXT_color_buffer_float, and not GL_EXT_color_buffer_half_float, and after careful reading of the extensions it seems its presence also qualifies to make fp16 formats color renderable.

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