Enable biarch debuggers with --enable-64-bit-bfd on x86-linux, sparc-linux

[David Miller]

From: "Joseph S. Myers" <joseph@codesourcery.com>
Date: Fri, 17 Apr 2009 11:00:12 +0000 (UTC)

> 2009-04-17  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* configure.tgt (i[34567]86-*-linux*): Use 64-bit configuration if
> 	--enable-64-bit-bfd.
> 	(sparc-*-linux*): Likewise.

This looks fine to me.