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Support linking against older giflibs - #62
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giflib 5.2.0 moved GifQuantizeBuffer() out of libgif, and the const GifByteType * signature appears in 5.2.2. A discussion from the giflib/Cinelerra ecosystem confirms that 5.1.6 and 5.2.1 still used the non-const form, while 5.2.2 changed it.
gif_lib.h exposes GIFLIB_MAJOR, GIFLIB_MINOR, and GIFLIB_RELEASE specifically for conditional compilation.