NetBSD patches from Gordon W. Ross <gwr@mc.com>:

	NetBSD patches from Gordon W. Ross <gwr@mc.com>:
	* netbsd.h (MACHTYPE_OK): Define.
	(MY(write_object_contents)): Use DEFAULT_ARCH and DEFAULT_MID when
	calling N_SET_MACHTYPE, rather than having a switch.
	* libaout.h (enum machine_type): Add M_PMAX_NETBSD, M_VAX_NETBSD,
	and M_ALPHA_NETBSD.
	* i386netbsd.c (MACHTYPE_OK): Don't define.
	(DEFAULT_MID): Define.
	* m68k4knetbsd.c (SEGMENT_SIZE): Don't define.
	(MACHTYPE_OK): Don't define.
	(DEFAULT_MID): Define.
	* m68knetbsd.c: (MACHTYPE_OK): Don't define.
	(DEFAULT_MID): Define.
	* ns32knetbsd.c (MACHTYPE_OK): Don't define.
	(DEFAULT_MID): Define.
	* sparcnetbsd.c (MACHTYPE_OK): Don't define.
	(DEFAULT_MID): Define.