libstdc++: Move closing brace outside #endif [PR104866]

libstdc++-v3/ChangeLog:

	PR libstdc++/104866
	* include/bits/this_thread_sleep.h: Fix order of #endif and
	closing brace of namespace.

libstdc++-v3/include/bits/this_thread_sleep.h

@@ -105,8 +105,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	    __now = _Clock::now();
 	  }
       }
-  } // namespace this_thread
 #endif // ! NO_SLEEP
+  } // namespace this_thread
 
   /// @}