PR libstdc++/57641
* include/std/mutex (timed_mutex, recursive_timed_mutex): Move common
functionality to new __timed_mutex_impl mixin. Overload try_lock_until
to handle conversion between different clocks. Replace constrained
__try_lock_for_impl overloads with conditional increment.
* include/std/shared_mutex (shared_mutex::_Mutex): Use the new mixin.
* testsuite/30_threads/timed_mutex/try_lock_until/57641.cc: New.
From-SVN: r200180
