calling/runtime convention for ppc fbsd

[peterg at ptree32.com.au]

>>  The one exception is that long doubles are 64-bit and not 128-bit.
>> OSX/NetBSD/Linux on powerpc all use 64-bit long doubles, so it
>> didn't seem to make a lot of sense to follow the ABI strictly there.
>
>OS-X does support long double with 128-bit :) At least the newer gcc's. 
>The os itself, well another question.

 Doh, it didn't when I checked last time :(  The problem with 128-bit
floats is that they're mostly done in s/w.

later,

Peter.