Bump gcc and newlib for 4.12?

[Chris Johns]

On 29/03/2016 11:05, Joel Sherrill wrote:
>
> Given the feature flag changes in newlib and some warning fine-tuning in
> gcc, I think we should bump the tools on the master on the master after
> the next newlib and pick up a close gcc snapshot.
>
> Hopefully I can merge the random/srandom patch in the next day or two
> and it be in time.
>
> Thoughts?
>

If you are happy then fine by me. It would be good to get the newlib 
changes exposed to more users.

Chris