Changed nextdetacher::do_unsubscribe from atomic to volatile.
Changed nextdetacher::do_unsubscribe from atomic to volatile.

alexeymarkov/RxCpp,ReactiveX/RxCpp,Reactive-Extensions/RxCpp,Reactive-Extensions/RxCpp,alexeymarkov/RxCpp,ReactiveX/RxCpp,alexeymarkov/RxCpp,ReactiveX/RxCpp,Reactive-Extensions/RxCpp