* sunos.c (sunos_slurp_dynamic_symtab): New static function,

	* sunos.c (sunos_slurp_dynamic_symtab): New static function,
	broken out of sunos_canonicalize_dynamic_symtab.
	(sunos_canonicalize_dynamic_symtab): Call new function
	sunos_slurp_dynamic_symtab.
	(sunos_add_dynamic_symbols): Add three new parameters.  Return the
	dynamic symbol table to the caller.
	* aoutx.h (aout_link_add_symbols): Permit add_dynamic_symbols
	callback to override the symbols being read.
	* libaout.h (struct aout_backend_data): Add three new parameters
	to add_dynamic_symbols callback.