Addition to unix: raw ByteString APIs

[Evan Laforge]

>      - There is a new function
>
>         System.Posix.ByteString.getArgs :: [ByteString]
>
>        returning the raw untranslated arguments as passed to exec()
>        when the program was started.

Is this one similar to the [String] getArgs in that it drops unix's
argv[0]?  I was recently surprised by that in the standard getArgs
because I wanted a program to restart itself.  I can't figure out how
to do that without access to argv[0].

I suppose for consistency the ByteString version should have the same
behaviour, so maybe this is just an opportunity to wonder why it does
that in the first place.