https://bugs.gentoo.org/934054

From: Bill Prendergast <dek.devel@baisenvar.info>

Fix build with newer net-libs/miniupnpc (API 18)
--- a/Swiften/Network/MiniUPnPInterface.cpp
+++ b/Swiften/Network/MiniUPnPInterface.cpp
@@ -45,9 +45,16 @@ MiniUPnPInterface::MiniUPnPInterface() : p(new Private()) {
     }
 
     char lanAddress[64];
+#if MINIUPNPC_API_VERSION > 17
+    char wanAddress[64];
+    if (!UPNP_GetValidIGD(p->deviceList, &p->urls, &p->data, lanAddress, sizeof(lanAddress), wanAddress, sizeof(wanAddress))) {
+        return;
+    }
+#else
     if (!UPNP_GetValidIGD(p->deviceList, &p->urls, &p->data, lanAddress, sizeof(lanAddress))) {
         return;
     }
+#endif
     p->localAddress = std::string(lanAddress);
     p->isValid = true;
 }