[issue3132] implement PEP 3118 struct changes

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> > The possibility of mixing native size/alignment with standard 
> > size/alignment in a single format string makes me a bit uneasy
> 
> I agree.  It is hard for me to see how this might be used.

Without having anything more constructive to add, I also agree with this
gut feeling. Perhaps not all of the PEP needs implementing; we can just
add what is genuinely useful.

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