[patch/rfc] more structs.exp kfails

[J. Johnston]

Andrew Cagney wrote:
> 
> The attatched tweaks structs.exp so that it KFAILs the case where a 
> "return struct" fails because the target hasn't implemented the relevant 
> code.
> 
> Jeff and I were puzzling over an apparent regression in the ia64 - this 
> better clasifies it as something that is known to have never worked.
> 
> So, jeff, if it works for you, I'll commit it in a day or so,
> Andrew

The patch works but it uncovers two separate bugs.  1. printing long doubles on 
the ia64 is hosed  2. once fixing printing long doubles, doing a p/c on a long 
double value causes it to spit out the hex bytes of the long double

That doesn't affect whether you should check this in.  I will shortly post a fix 
for the ia64-tdep file.

-- Jeff J.