Updating top-level autoconf to 2.59

[Mike Stump]

On Feb 7, 2007, at 3:51 PM, Joseph S. Myers wrote:
> With this patch, configuring with --build=i686-pc-linux-gnu -- 
> host=i686-pc-linux-gnu --target=i686-pc-linux-gnu all specified  
> explicitly results in i686-pc-linux-gnu-gcc and i686-pc-linux-gnu- 
> i686-pc-linux-gnu-gcc being installed but no plain "gcc".   
> Installing i686-pc-linux-gnu-i686-pc-linux-gnu-gcc is clearly wrong  
> and existing practice is that "gcc" is installed whenever the host  
> and target are the same, regardless of the build system and  
> regardless of what was or was not specified explicitly.

As I recall, this was previously discussed and an intentional change  
in behavior in autoconf.  The solution is to build with just -- 
host=i686-pc-linux-gnu.