Require binutils 2.20 or later to build glibc

[Joseph S. Myers]

On Mon, 27 Feb 2012, Ryan S. Arnold wrote:

> Yes, it's used to make early use of compiler and library performance
> and functionality improvements.  I just reviewed our scripting and
> verified that we don't actually build GLIBC in any stage with the
> system compiler, so we should be ok.

Thanks.  I've now committed the GCC >= 4.3 patch.  Marek, you may wish to 
do the removal of __GNUC_PREREQ conditionals you were interested in (only 
in files that are not installed, and probably not in files that are shared 
with gnulib either).

-- 
Joseph S. Myers
joseph@codesourcery.com