Disable UPnP by default

sunshine/upnp.cpp

@@ -73,6 +73,7 @@ public:
       : urls { std::move(urls) }, data { data }, begin { begin }, end { end } {}
 
   ~deinit_t() {
+    BOOST_LOG(info) << "Unmapping UPNP ports..."sv;
     unmap(urls, data, begin, end);
   }
 
@@ -134,6 +135,10 @@ std::unique_ptr<platf::deinit_t> start() {
     }
   }
 
+  if(!config::sunshine.flags[config::flag::UPNP]) {
+    return nullptr;
+  }
+
   auto it = std::begin(mappings);
 
   status = 0;