Import slang-1.4.9 patch

[Nerijus Baliunas]

On Sun, 24 Oct 2004 04:22:53 +0600 pavelsh <pavelsh at mail.ru> wrote:

>   Please, check my patch (import libslang-1.4.9 into mcslang).
>   
>   It's working fine for me.
> 
>   P.S.:FreeBSD-5.2.1

Working fine on AIX 5.1 too (with defining unix, see the end of the thread -
but this problem was with earlier slang also, so it's not a regression).

Nerijus