giflib: patch CVE-2025-31344

Pulled from https://github.com/OpenMandrivaAssociation/giflib/blob/master/giflib-5.2.2-cve-2025-31344.patch

(cherry picked from commit ca159cd3b8)

pkgs/by-name/gi/giflib/CVE-2025-31344.patch

@@ -0,0 +1,15 @@
+diff -up giflib-5.2.2/gif2rgb.c.omv~ giflib-5.2.2/gif2rgb.c
+--- giflib-5.2.2/gif2rgb.c.omv~	2025-04-07 21:44:54.956355983 +0200
++++ giflib-5.2.2/gif2rgb.c	2025-04-07 21:45:29.630769589 +0200
+@@ -329,6 +329,11 @@ static void DumpScreen2RGB(char *FileNam
+ 			GifRow = ScreenBuffer[i];
+ 			GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
+ 			for (j = 0; j < ScreenWidth; j++) {
++				/* Check if color is within color palete */
++				if (GifRow[j] >= ColorMap->ColorCount) {
++					GIF_EXIT(GifErrorString(
++					    D_GIF_ERR_IMAGE_DEFECT));
++				}
+ 				ColorMapEntry = &ColorMap->Colors[GifRow[j]];
+ 				Buffers[0][j] = ColorMapEntry->Red;
+ 				Buffers[1][j] = ColorMapEntry->Green;

pkgs/by-name/gi/giflib/package.nix

@@ -18,6 +18,7 @@ stdenv.mkDerivation rec {
   patches =
     [
       ./CVE-2021-40633.patch
+      ./CVE-2025-31344.patch
     ]
     ++ lib.optionals stdenv.hostPlatform.isMinGW [
       # Build dll libraries.