Updating top-level autoconf to 2.59

[Nick Clifton]

Hi Guys,

> On Dec 14, 2006, at 1:14 PM, Steve Ellcey wrote:
>>> But if you think we ought to keep it the way it is, I can probably come
>>> up with a workaround.
>>
>> I don't feel that strongly one way or the other.
> 
> As someone that will probably get hit by this, I too don't mind 
> accepting the change if autoconf wants to do it that way.

Agreed - or if we do not fix the problem then we really ought to issue a 
warning message if --build is used with an identical --target and --host.

Cheers
   Nick