egl: Refuse EGL_MESA_image_dma_buf_export if we don't have a DRM fourcc.
The EGL CTS expects that you can make images from all sorts of things, including things like z16 and s8, which we don't have DRM fourccs for. Just return an error when trying to export one of those. Reviewed-by: Marek Olšák <email@example.com>
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