install.texi and avr (was: Target maintainers: doc/install.texi love and care)

[Gerald Pfeifer]

On Sun, 12 Mar 2017, Gerald Pfeifer wrote:
> Also, I'm offering help around one particular aspect I noticed:
> 
> References to dependencies on really, really old versions of
> binutils (talking 10+ years here) which I think we can remove.
> Let me follow-up with some of you with concrete suggestions 
> around that.

The avr section currently has this:

  We @emph{strongly} recommend using binutils 2.13 or newer.

Okay to yank it?

Gerald