shared_mutex: try_lock_upgrade_until doesn't works

[viboes]

There is a bug on the code of shared_mutex::try_lock_upgrade_until. The following change fixes it.

         template <class Clock, class Duration>
         bool try_lock_upgrade_until(const chrono::time_point<Clock, Duration>& abs_time)
           boost::mutex::scoped_lock lk(state_change);
           while(state.exclusive || state.exclusive_waiting_blocked || state.upgrade)
           {
-              if(cv_status::no_timeout == shared_cond.wait_until(lk,abs_time))
+              if(cv_status::timeout == shared_cond.wait_until(lk,abs_time))
               {

[viboes]

(In [77290]) Thread: Fix error on pthread/shared_mutex.hpp try_lock_xxx_for, which should use the try_lock_xxx_until+fix #6674