Fix GifQuantizeBuffer signature conflict with system giflib

Update bundled giflib quantize.h and quantize.c to match the system
giflib signature by adding const qualifiers to input buffer parameters
(RedInput, GreenInput, BlueInput). This resolves compilation errors
when the bundled quantize.h conflicts with the system gif_lib.h header
which declares GifQuantizeBuffer with const input parameters.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: 2 people

giflib/quantize.c

@@ -61,9 +61,9 @@ int
 GifQuantizeBuffer(unsigned int Width,
                unsigned int Height,
                int *ColorMapSize,
-               GifByteType * RedInput,
-               GifByteType * GreenInput,
-               GifByteType * BlueInput,
+               const GifByteType * RedInput,
+               const GifByteType * GreenInput,
+               const GifByteType * BlueInput,
                GifByteType * OutputBuffer,
                GifColorType * OutputColorMap) {
 

giflib/quantize.h

@@ -15,8 +15,8 @@ SPDX-License-Identifier: MIT
  Color table quantization
 ******************************************************************************/
 int GifQuantizeBuffer(unsigned int Width, unsigned int Height,
-                   int *ColorMapSize, GifByteType * RedInput,
-                   GifByteType * GreenInput, GifByteType * BlueInput,
+                   int *ColorMapSize, const GifByteType * RedInput,
+                   const GifByteType * GreenInput, const GifByteType * BlueInput,
                    GifByteType * OutputBuffer,
                    GifColorType * OutputColorMap);