* aoutf1.h (sunos_<size>_object_p, sunos4_callback): moved the

	* aoutf1.h (sunos_<size>_object_p, sunos4_callback): moved the
	computation of arch and machine type so it's worked out before
	some_aout_object_p is called.
	* aoutx.h: (some_aout_object_p): don't set arch and mach to
	unknown.
	* archures.c: add extra field 'section_align_power' to hold
	default section alignment in object files.
	* cpu-a29k.c, cpu-h8300.c, cpu-i386.c, cpu-i960.c, cpu-m68k.c,
	cpu-m88k.c, cpu-mips.c, cpu-rs6000.c, cpu-sparc.c, cpu-vax.c:
	initialize the new field.
	* bout.c (b_out_callback): replace the text size, since aout
	fries them.
	* aoutx.h: Documentation in the new style