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mesa: Skip 3-byte array formats in _mesa_array_format_flip_channels

Michel Dänzer requested to merge daenzer/mesa:_mesa_array_format_flip_channels-3-channels into master

Byte swapping makes no sense for 3-byte formats: Swapping the order of 2 or 4 bytes at a time would inevitably result in bytes getting mixed up between neighbouring pixels.

Fixes crash with a debugging build on a big endian machine due hitting the unreachable() at the end of the function.

Closes: #2665 (closed)

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