[patch/rfc] Rewrite "structs" testcase

[Michael Snyder]

Michael Elizabeth Chastain wrote:
> I'm concerned about the use of "long long" in a test program.
> What if someone uses a non-gcc Ansi C compiler?
> But this doesn't look any worse than other tests, so okay.
> 
> In structs.exp, line 22:
> 
>   # This file was written by Jeff Law. (law@cygnus.com)

Huh!  I dont understand.  This file was definitely written by
Michael Snyder.  Ah, well, looks as if it's been extensively
re-written since then...