* sysdeps/powerpc/elf/libc-start.c

	* sysdeps/powerpc/elf/libc-start.c
	(__cache_line_size): Declare.
	(__aux_init_cache): New.
	(__libc_start_main): Change type of `auxvec' parameter to
	`ElfW(auxv_t) *'.  Correct walking of aux vector.  Call
	__aux_init_cache.
	* sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c
	(__cache_line_size): Declare.
	(__aux_init_cache): New.
	(DL_PLATFORM_INIT): Define.
	* sysdeps/powerpc/memset.S: Define __cache_line_size and use its
	value to select the correct stride for dcbz.