Re: Update some sim copyright headers to GPLv3-or-later

[Joel Brobecker <brobecker at adacore dot com>]

> this is common behavior when using aclocal.  but the sourceware tree
> does try to be a bit more "stand alone" when it comes to 3rd party
> dependencies.  i think the Blackfin sim subdir is treading somewhat
> new water here.
> 
> maybe the answer is to copy pkg.m4 from the latest pkg-config release
> into the top level config/ dir ?

This is indeed what Ralf suggested privately. I think it would be
helpful doing that - it guaranties that we can reproduce the same
result as anyone else (shielding us from variations in pkg-config,
for instance).

Thanks!
-- 
Joel