no timeout for select() in MainLoop thread

[MikeTuev]

I guess it make sense: there is no timeout for select specified. So program will never shutdown or shutdown if there will be no activity on the network.

mdns_cpp/src/mdns.cpp

Line 440 in 05b181c

if (select(nfds, &readfs, 0, 0, 0) >= 0) {