Adding binutils to the GNU Toolchain buildbot on sourceware

[Frank Ch. Eigler]

Hi -

> An additional buildbot job for gdb/gdbserver would be fine. It's just that a
> single build for everything is simpler, in my opinion.

Yes, that would be interesting.

> Is the idea to revive the old buildbot we had for GDB, but for binutils?

We're welcoming the gdb project on the new buildbot server.  Just need
to set up some workers from the community.

- FChE