net-p2p/litecoin: fix build with miniupnpc 2.2.8

PR: 280298

net-p2p/litecoin/files/patch-src_net.cpp

@@ -0,0 +1,14 @@
+--- src/net.cpp.orig	2024-03-28 17:05:26 UTC
++++ src/net.cpp
+@@ -1637,7 +1637,11 @@ static void ThreadMapPort()
+     struct IGDdatas data;
+     int r;
+ 
++#if MINIUPNPC_API_VERSION >= 18
++    r = UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr), NULL, 0);
++#else
+     r = UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr));
++#endif
+     if (r == 1)
+     {
+         if (fDiscover) {