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msDrawRasterLayerGDAL(): find alpha band even if not 4th one (#5216)
Currently, in the absence of a BANDS processing directive, msDrawRasterLayerGDAL() only checks that if the 4th band is the alpha band when the raster has 4 or more bands. But for some products, the 4th band might be the last one, so we'd better check the color interpretation of all bands >= 4th one.
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