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renderer/native: Allow manual selection of the framebuffer format

Daniel van Vugt requested to merge vanvugt/mutter:force-framebuffer-format into main

Allow manual selection of the framebuffer format using the environment variable MUTTER_FORCE_FRAMEBUFFER_FORMAT with a FourCC string.

Examples that work with Intel graphics:

XR24 = 24-bit "True color", 4 bytes per pixel (mutter's default)
XR30 = 30-bit "Deep color", 4 bytes per pixel
RG16 = 16-bit "High color", 2 bytes per pixel

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