update-copyright.py for binutils

[Paul Smith]

On Thu, 2017-01-05 at 00:08 +1030, Alan Modra wrote:
> This is a modified form of gcc's contrib/update-copyright.py.
> It's what I've been using over the last couple of years to update our
> copyright years.

FYI, many GNU tools are using the update-copyright utility from gnulib
to manage this:

http://git.savannah.gnu.org/cgit/gnulib.git/tree/build-aux/update-copyright

Maybe these could be merged somehow.