Hello,

The attached patch fixes the 32 bit PPC GNU/Linux (and AIX) struct 
return code.  PowerOpen returns all structures via a pointer, not just 
the odd sized ones (which is what the generic struct return method tests 
for).

32 bit PPC GNU/Linux, for historic reasons, continues to use this 
convention.  Tested on 32 bit GNU/Linux where structs.exp and 
callfuncs.exp stopped failing.

Note that for GNU/Linux I've made this 32 bit specific.  PPC64 is going 
to need a new method.

ok?
Andrew