Only declare sys_errlist and sys_nerr on `linux' targets

[Ulrich Drepper]

Roland McGrath wrote:
> That looks ok to me.  An alternate approach I almost finished implementing
> is to define some macro in bits/stdio_lim.h and use #if on that in stdio.h.
> That saves adding a file, but is a bit more crufty.

I agree.

> I would like to put one of these two changes in (to 2.2 as well) if others
> agree.

Feel free to do it.  It's an error.

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