Merge branch 'upnpn18' into 'next'

Fix compilation broken on latest miniupnpc version (resolves #1274)

Closes #1274

See merge request STJr/SRB2!2496

src/netcode/i_tcp.c

@@ -317,7 +317,11 @@ init_upnpc_once(struct upnpdata *upnpuserdata)
 		I_OutputMsg(M_GetText("Found UPnP device:\n desc: %s\n st: %s\n"),
 		           dev->descURL, dev->st);
 
+#if (MINIUPNPC_API_VERSION >= 18)
+		UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr), NULL, 0);
+#else
 		UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr));
+#endif
 		I_OutputMsg(M_GetText("Local LAN IP address: %s\n"), lanaddr);
 		descXML = miniwget(dev->descURL, &descXMLsize, scope_id, &status_code);
 		if (descXML)