Re: _bfd_free_cached_info

ELF targets with target-specific free_cache_info functions need to
call _bfd_elf_free_cached_info, not _bfd_generic_bfd_free_cached_info.

	* elf64-ppc.c (ppc64_elf_free_cached_info): Call
	_bfd_elf_free_cached_info.
	* elfnn-aarch64.c (elfNN_aarch64_bfd_free_cached_info): Likewise.