Remove ftp.uu.net from gnu fetch group

[Joshua Root]

Ryan Schmidt wrote:
> The readline port uses the gnu fetch group to download.
> 
> ftp://ftp.uu.net/archive/systems/gnu/ is in that group.
> 
> But ftp://ftp.uu.net/archive/systems/gnu/readline/ doesn't appear to  
> have any current readline files.
> 
> All modifications dates on that server seem to be 2001-06-29. If the  
> mirror hasn't been updated since then, we should remove it from the  
> list of gnu mirrors.
> 
> Comments?

Agreed, there's no point having such a stale mirror in the list.

- Josh