Hello,

This adds a new ppc32 SYSV specific extract_return_value and 
store_return_value (while at the same time eliminating the e500 specific 
methods).  The new functions also avoid some really bogus looking 
floating point code in the old rs6000 * return_value functions - I'm 
still trying to figure out how it worked ... ah, it's native only.

I've tested it in vanila GNU/Linux (no regressions) and NBSD (4 less 
structs fails) (i.e., no altivec nor e500).

If nothing else I'd really like a comment on the general approach taken 
- the netbsd function wrapping a more generic method, and a better word 
than "broken" I guess.

thoughts?
Andrew

PS: My comments refer to SYSV ppc32 but the change does also affect SYSV 
ppc64, "can I get back to you on that" :-)