Passing `binmode: true` to `IO.pipe` should behave like `binmode`

When passing `binmode: true` to `IO.pipe`, it should behave the same way
as calling `binmode` on each of the file handles.  It should set the
file to binmode *and* set the encoding to binary on the file.

Before this commit, passing `binmode: true` to `IO.pipe` would make
`binmode?` return `true`, but the file's encoding would remain the same
as the default encoding.  Passing `binmode: true` should make `binmode?`
return `true` *and* set the encoding to binary.

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