PowerPC64, error on unsupported dynamic relocation

PowerPC64, error on unsupported dynamic relocation

This patch corrects the set of dynamic relocations recognised by gold
as supported by glibc, and teaches ld.bfd to report an error similar
to the gold error.  Note that ld --noinhibit-exec can be used to
produce an output, supporting older ld with newer glibc if the set of
supported glibc dynamic relocations changes.

bfd/
	* elf64-ppc.c (ppc64_glibc_dynamic_reloc): New function.
	(ppc64_elf_relocate_section): Error if emitting unsupported
	dynamic relocations.
gold/
	* powerpc.cc (Target_powerpc::Scan::check_non_pic): Move REL24
	to 32-bit supported.