transition git-hooks on sourceware.org to Python 3.x

[Joel Brobecker]

> > For binutils-gdb, the transition has been made a few weeks ago,
> > and so far so good :). So I'm inviting you all to transition
> > this new version at your convenience.
> > 
> > Remember that, if your project's configuration calls some Python
> > hooks, you'll probably want to double-check that they are compatible
> > with Python 3.x!
> 
> I did the same for newlib-cygwin.git just a couple of minutes ago.
> Hopefully this works as nicely as for biunutils-gdb :}

No news must be good news. Well done, Corinna :).

-- 
Joel