Better indirect and warning symbol handling inspired by Stuart

	Better indirect and warning symbol handling inspired by Stuart
	Quick <stuck@cs.man.ac.uk>.
	* linker.c (enum link_action): Add REF, MIND, CWARN, REFC.
	(link_action): Change UNDEF_ROW/def and UNDEFW_ROW/def from NOACT
	to REF.  Change UNDEF_ROW/indr and UNDEFW_ROW/indr from CYCLE to
	REFC.  Change DEF_ROW/indr and COMMON_ROW/indr from CYCLE to MDEF.
	Change DEFW_ROW/indr from CYCLE to NOACT.  Change INDR_ROW/indr
	from MDEF to MIND.  Change INDR_ROW/warn from WARNC to CYCLE.
	Change WARN_ROW/def and WARN_ROW/indr from MWARN to CWARN.  Change
	WARN_ROW/com from MWARN to WARN.  Change WARN_ROW/warn from NOACT
	to CYCLE.  Change SET_ROW/warn from WARNC to CYCLE>
	(_bfd_generic_link_add_one_symbol): Handle REF, MIND, CWARN and
	REFC.  If a new indirect symbol has been referenced, push the
	reference down to the symbol it points to.  FIx handling of WARN.
	* aoutx.h (translate_from_native_sym_flags): If N_WARNING, don't
	clobber e_type of next symbol.
	(translate_to_native_sym_flags): Likewise.
	(aout_link_write_symbols): Loop on bfd_link_hash_warning as well
	as bfd_link_hash_indirect.