Update some sim copyright headers to GPLv3-or-later

[Joel Brobecker]

> what i mean is worrying about the flow of code.  if they aren't both
> GPLv2 based, i now have to worry about people being able to make the
> claim that i'm committing GPLv3 sim code to the GPLv2 kernel and
> tainting it.  considering the code in question, doing GPLv3 on it will
> gain nothing.

I have relayed the above to the FSF.

> > I don't understand exactly the status of this file. Can I just
> > regenerate the "reverted" version and the project will still work?
> 
> next time someone runs `aclocal` (like me), it'll blow away your
> changes as it copies m4 macros from files in /usr/share/ and into the
> aclocal.m4.

I ran aclocal myself, and it blew away more than just my change,
but the entire block of code. Does it mean that only you are able
to regenerate this file properly?

Attached is what I applied to revert this part of patch.

-- 
Joel
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