* corelow.c (init_core_ops): Delete references to to_require_attach

	* corelow.c (init_core_ops): Delete references to to_require_attach
	and to_require_detach.
	* exec.c (init_exec_ops): Likewise.
	* hppah-nat.c (child_follow_fork): Call hppa_require_attach and
	hppa_require_detach directly.
	* inferior.h (REQUIRE_ATTACH, REQUIRE_DETACH): Delete.
	* inftarg.c (child_detach): Remove.
	(child_detach_from_process): Rename to child_detach, remove
	after_fork argument.
	(child_attach): Remove.
	(child_attach_to_process): Rename to child_attach, remove after_fork
	argument.
	(init_child_ops): Delete references to to_require_attach
	and to_require_detach.
	* infttrace.c (hppa_require_attach): Update comment.
	* target.c (cleanup_target, update_current_target)
	(init_dummy_target, setup_target_debug): Delete references to
	to_require_attach and to_require_detach.
	(find_default_require_detach, find_default_require_attach)
	(debug_to_require_attach, debug_to_require_detach): Remove
	functions.
	* target.h (struct target_ops): Remove to_require_attach
	and to_require_detach.
	(target_require_attach, target_require_detach): Delete macros.
	(find_default_require_detach, find_default_require_attach): Delete
	prototypes.
	* config/pa/nm-hppah.h (REQUIRE_ATTACH, REQUIRE_DETACH): Delete.