Improve biarch x86-linux support

[Nick Clifton]

Hi Joseph,

> 2006-10-18  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* configure.tgt (i[3-7]86-*-linux-*): Also define
> 	targ_extra_libpath in want64 case.
> 	* emulparams/elf_x86_64.sh: Handle i[3-7]86-*-linux-* the same as
> 	x86_64*-linux*.

Approved - please apply.

Cheers
   Nick