windows build fixes

include/libtorrent/thread.hpp

@@ -40,6 +40,8 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <winsock2.h>
 #endif
 
+#include <memory> // for auto_ptr required by asio
+
 #include <boost/asio/detail/thread.hpp>
 #include <boost/asio/detail/mutex.hpp>
 #include <boost/asio/detail/event.hpp>
@@ -50,9 +52,9 @@ namespace libtorrent
 	typedef boost::asio::detail::mutex mutex;
 	typedef boost::asio::detail::event event;
 
-	void sleep(int milliseconds);
+	TORRENT_EXPORT void sleep(int milliseconds);
 
-	struct condition
+	struct TORRENT_EXPORT condition
 	{
 		condition();
 		~condition();