libraw1394 struct layouts, i386 vs. x86_64

[Kevin D. Clark]

Michael ODonnell writes:

> I've been looking for something like a magic compiler switch to force
> the desired 64bit-style alignments to our 32bit builds - anybody know
> what the trick is in this case?

The only way that I've ever been able to be 100% sure of the way a
structure gets packed with all of the architectures/compilers I've had
to deal with was to pack the structure myself....pretty much by hand.

I also always as a matter of paranoia sprinkle my code with asserts()
to make sure that the compiler is doing *exactly* what I want.  Some of
the readers of this list might appreciate this:

  http://kdc-blog.blogspot.com/2008/03/debugging-war-story-2.html

...which describes how I write these asserts().

Kind regards,

--kevin
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