website/cmd/ttyshot: Simplify implementation of wait-* ops.
website/cmd/ttyshot: Simplify implementation of wait-* ops.

No need to relay a file to a channel in order to be able to read from it with a
timeout; just use select(2) (wrapped by eunix.WaitForRead).

elves/elvish,elves/elvish,elves/elvish,elves/elvish,elves/elvish