* config.bfd: Add powerpc64 target. Add powerpc64 vectors to

	* config.bfd: Add powerpc64 target.  Add powerpc64 vectors to
	targ64_selvecs for 32 bit powerpc targets.
	* Makefile.am (BFD64_BACKENDS): Add elf64-ppc.lo.
	(BFD64_BACKENDS_CFILES): Add elf64-ppc.c.
	Run "make dep-am".
	* Makefile.in: Regenerate.
	* configure.in: Add elf64_powerpc vecs.
	* configure: Regenerate.
	* cpu-powerpc.c: Default to bfd_mach_ppc_620 entry for 64 bit.
	* elf.c (prep_headers): EM_PPC64 for 64 bit ppc elf target.
	* targets.c: Add bfd_elf64_powerpc_vec and bfd_elf64_powerpcle_vec.
	* elf64-ppc.c: New file.
	* reloc.c: Add powerpc64 relocs.
	* libbfd.h: Regenerate.
	* bfd-in2.h: Regenerate.