Bump gcc and newlib for 4.12?

[Joel Sherrill]

Hi

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?

--joel
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