event: actually needs poll (#2605)

Epoll::wait requires EpollTimeout which is a type alias for PollTimeout,
which is blocked by `poll` feature

Author: pacak

Cargo.toml

@@ -41,7 +41,7 @@ acct = []
 aio = ["pin-utils"]
 dir = ["fs"]
 env = []
-event = []
+event = ["poll"]
 fanotify = []
 feature = []
 fs = []