Addition to unix: raw ByteString APIs

[Johan Tibell]

I'm in favor. Two comments:

* System/Posix/ByteString/FilePath.hsc sticks out a bit as it's the only
module that doesn't follow the Foo.Bar.ByteString pattern (i.e. ByteString
as the leaf module).

* Should we newtype RawSystemPath? I cannot come up with a really good
argument for it, but every time we don't hide our representations we end up
getting screwed (see String, FilePath). We could provide an IsString
instance and toPath/fromPath (or similarly named) helpers.

-- Johan
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