message: Patched libpng to address CVE-2019-7317
diff: @@ -4588,8 +4588,7 @@ png_image_free(png_imagep image)
  if (image != NULL && image->opaque != NULL &&
  image->opaque->error_buf == NULL)
  {
  - /* Ignore errors here: */
  - (void)png_safe_execute(image, png_image_free_function, image);
  + png_image_free_function(image);
  image->opaque = NULL;
  }
  }
  