File gcc-13.patch of Package ip2unix

From: Adam Mizerski <adam@mizerski.pl>
Date: 2023-03-28 21:20:44 +0200
Subject: fix building with gcc-13
References: https://github.com/nixcloud/ip2unix/issues/31
Upstream: submitted

Index: ip2unix-2.1.4/src/sockaddr.hh
===================================================================
--- ip2unix-2.1.4.orig/src/sockaddr.hh
+++ ip2unix-2.1.4/src/sockaddr.hh
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: LGPL-3.0-only
 #ifndef IP2UNIX_SOCKETADDR_HH
 #define IP2UNIX_SOCKETADDR_HH
+#include <optional>
+#include <string>
 #include <variant>
 
 #include <netinet/in.h>