* elf64-ppc.c: Remove stale part of ABI comment.
(NO_OPD_RELOCS): Define.
(ppc64_elf_check_relocs): Use it.
(ppc64_elf_relocate_section): Here too.
(build_one_stub): Don't point function syms at the stub. Instead,
hijack plt.offset.
(ppc64_elf_relocate_section): Check whether REL24 relocs should
really go to the stub. Make all dynamic relocs in opd against
locals.
(ppc64_elf_finish_dynamic_symbol): Allow for non-standard use of
plt.offset.