Network/SocketPoller: Wait() now returns the number of active sockets, and optionally the last error

It will also ignore the EINTR error on Linux

src/Nazara/Network/Linux/SocketPollerImpl.hpp

@@ -30,7 +30,7 @@ namespace Nz
 			bool RegisterSocket(SocketHandle socket, SocketPollEventFlags eventFlags);
 			void UnregisterSocket(SocketHandle socket);
 
-			int Wait(int msTimeout, SocketError* error);
+			unsigned int Wait(int msTimeout, SocketError* error);
 
 		private:
 			std::unordered_set<SocketHandle> m_readyToReadSockets;