Remove tests from vendored mpsc queue
Remove tests from vendored mpsc queue

Ticki/crossbeam,aturon/crossbeam,crossbeam-rs/crossbeam,ticki/baguette,msullivan/crossbeam,phil-opp/crossbeam,crossbeam-rs/crossbeam,steveklabnik/crossbeam,schets/crossbeam,crossbeam-rs/crossbeam,alexcrichton/crossbeam,crossbeam-rs/crossbeam,huonw/crossbeam