Releases 2.27 and 2.26.1

[Cary Coutant]

> I'd like to create the 2.27 branch soon, and also to build the 2.26.1 release.
> If you have any pending patch you'd like to have in one of these releases, please speak quickly!

There are three pending MIPS patches for gold that should be landing
today, one adding MIPS R6 support. It would be nice to include those
in 2.27, and this will be a good opportunity for me to finally bump
gold's version number.

-cary