Require binutils 2.20 or later to build glibc

[Marek Polacek]

On Mon, Feb 27, 2012 at 11:09:55PM +0000, Joseph S. Myers wrote:
> 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).

Ok, I'm on it.  Thanks,

	Marek