修复编译问题

webrtc/IceServer.cpp

@@ -520,7 +520,7 @@ namespace RTC
             return;
 
         this->selectedTuple = storedTuple;
-        this->lastSelectedTuple = static_pointer_cast<RTC::TransportTuple>(storedTuple->shared_from_this());
+        this->lastSelectedTuple = std::static_pointer_cast<RTC::TransportTuple>(storedTuple->shared_from_this());
 
         // Notify the listener.
         this->listener->OnIceServerSelectedTuple(this, this->selectedTuple);