(TARGET_AT_PHNUM, TARGET_AT_PAGESZ, TARGET_AT_BASE)
	(TARGET_AT_FLAGS, TARGET_AT_ENTRY, TARGET_AT_UID, TARGET_AT_EUID)
	(TARGET_AT_GID, TARGET_AT_EGID, TARGET_AT_HWCAP)
	(TARGET_AT_CLKTCK): Remove redundant macros.
	(AUX_ENT): Adjust to use standard ELF AT_* macros.
	(AUX_ENTF): Ditto.  Remove always-0 middle argument.  Update all
	callers.
	(sim_open): Also pass AT_SECURE.