[issue1789] incorrect assumption about unsigned long byte size

[Gregory P. Smith]

Gregory P. Smith added the comment:

eew, so the struct module does map as documented to the C types listed
in the docs.  yuck.  regardless, changing the Ls to Is will fix the
tutorial document code.  I'll do that.

I believe there are also other instances of wrong uses of L in struct in
the code such as the zipfile module that will fail on LP64 platforms. 
I'll look for those (and why they weren't caught by unit tests).

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<http://bugs.python.org/issue1789>
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