* targets.c (netbsd_core_vec): Declare. From Gordon W. Ross

	* targets.c (netbsd_core_vec): Declare.  From Gordon W. Ross
	<gwr@mc.com>.

	* libaout.h (struct aout_backend_data): Add entry_is_text_address
	field.
	* aout-target.h (SEGMENT_SIZE): Define to TARGET_PAGE_SIZE at the
	start of the file.  Remove uses later on which switch using
	ifdef.
	(MY(callback)): Handle entry_is_text_address.
	(MY_entry_is_text_address): Define if not defined.
	(MY(backend_data)): Initialize new field.
	* aoutf1.h (sunos4_aout_backend): Likewise.
	* i386aout.c (MY(backend_data)): Likewise.
	* i386mach3.c (MY(backend_data)): Likewise.
	* mipsbsd.c (MY(backend_data)): Likewise.
	* sparclynx.c (sparclynx_aout_backend): Likewise.
	* netbsd.h (SEGMENT_SIZE): Define if not defined.
	(MY_entry_is_text_address): Define.
	* m68knetbsd.c (SEGMENT_SIZE): Define as 0x20000