Use readdir instead of readdir_r

To eliminate compiler warnings, we're single-threaded anyway.

plugins/lua-loader.c

@@ -424,20 +424,9 @@ initialize (void *ctx, struct plugin_api *api)
 	lua_setfield (L, -2, "__index");
 	luaL_setfuncs (L, xlua_unit_table, 0);
 
-	struct dirent buf, *iter;
-	while (true)
+	struct dirent *iter;
+	while ((errno = 0, iter = readdir (dir)))
 	{
-		if (readdir_r (dir, &buf, &iter))
-		{
-			print_fatal ("%s: %s: %s", "Lua", "readdir_r", strerror (errno));
-			break;
-		}
-		if (!iter)
-		{
-			success = true;
-			break;
-		}
-
 		char *dot = strrchr (iter->d_name, '.');
 		if (!dot || strcmp (dot, ".lua"))
 			continue;
@@ -446,6 +435,10 @@ initialize (void *ctx, struct plugin_api *api)
 		(void) load_one_plugin (L, iter->d_name, path);
 		free (path);
 	}
+	if (errno)
+		print_fatal ("%s: %s: %s", "Lua", "readdir", strerror (errno));
+	else
+		success = true;
 
 end:
 	closedir (dir);