fixup??? Introduce helper to create symlinks that knows about index_state

The `orig_index` moved into the field `priv`.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

merge-recursive.c

@@ -987,7 +987,7 @@ static int update_file_flags(struct merge_options *opt,
 			char *lnk = xmemdupz(buf, size);
 			safe_create_leading_directories_const(path);
 			unlink(path);
-			if (create_symlink(&opt->orig_index, lnk, path))
+			if (create_symlink(&opt->priv->orig_index, lnk, path))
 				ret = err(opt, _("failed to symlink '%s': %s"),
 					  path, strerror(errno));
 			free(lnk);