PowerPC non-"sysv"

[Daniel Jacobowitz]

Right now, we have two different supported ABIs to call functions on
PowerPC.  Which to use is determined by:

  sysv_abi = info.abfd && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour;

What do we still support that this applies to, besides AIX?  I'm
planning to implement a "set powerpc abi" command, like the equivalent
ARM one; it will default to auto, which will make the same choice it
does now, but I'm not sure what to call the options.

-- 
Daniel Jacobowitz
CodeSourcery