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render/pixel-format: Move has_alpha into it's own array

Some opaque pixel formats (nv12, p010) require per-plane bytes_per_block info. However, it doesn't make sense to store them in wlr_pixel_format_info, as they will never be useful (currently, this info is used for shm, which doesn't have a concept of multi-planar buffers.)

Let's define a separate array and function for determining whether a pixel format has alpha.

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