Fix FTBFS with libgif >= 4.2.0

kernel/kls_gif/fmt_codec_gif.cpp

@@ -39,6 +39,22 @@ extern "C" {
 
 #include "../xpm/codec_gif.xpm"
 
+/* GIFLIB_MAJOR is only defined in libgif >= 4.2.0 */ 
+/* libgif 4.2.0 has retired PrintGifError() and added GifErrorString() */ 
+#if defined(GIFLIB_MAJOR) && defined(GIFLIB_MINOR) && \ 
+        ((GIFLIB_MAJOR == 4 && GIFLIB_MINOR >= 2) || GIFLIB_MAJOR > 4) 
+static void PrintGifError(void)
+{
+  char *Err = GifErrorString();
+
+  if (Err != NULL) {
+    fprintf(stderr, "\nGIF-LIB error: %s.\n", Err);
+  } else {
+    fprintf(stderr, "\nGIF-LIB undefined error %d.\n", GifError());
+  }
+} 
+#endif 
+
 /*
  *
  * Originally designed to facilitate image transfer and online