fixed compilation error when not using boost.date_time. Fixed compilation error when not having DHT logging enabled

include/libtorrent/kademlia/node.hpp

@@ -123,9 +123,11 @@ public:
 	data_iterator end_data() { return m_map.end(); }
 	int data_size() const { return int(m_map.size()); }
 
+#ifdef TORRENT_DHT_VERBOSE_LOGGING
 	void print_state(std::ostream& os) const
 	{ m_table.print_state(os); }
-	
+#endif
+
 	void announce(sha1_hash const& info_hash, int listen_port
 		, boost::function<void(std::vector<tcp::endpoint> const&
 			, sha1_hash const&)> f);

include/libtorrent/time.hpp

@@ -91,6 +91,7 @@ namespace libtorrent
 	struct time_duration
 	{
 		time_duration() {}
+		time_duration operator/(int rhs) const { return time_duration(diff / rhs); }
 		explicit time_duration(boost::int64_t d) : diff(d) {}
 		boost::int64_t diff;
 	};