Updating top-level autoconf to 2.59

[Maciej W. Rozycki]

On Fri, 9 Feb 2007, Erik Christiansen wrote:

> --build seems to be a synonym for --host, so its only useful purpose
> that I've imagined so far is to specify a native build if configure
> fails to detect that to the user's satisfaction. (And that could be done
> with --host, if that did not spuriously trigger a cross.)

 The "--build" option lets you specify your non-canonical name of the 
build system, e.g. if you want to have your native binutils installed 
under /usr/i386-linux/bin rather than /usr/i686-pc-linux-gnu/bin (in 
addition to /usr/bin that is).

  Maciej