* nlmcode.h (nlm_object_p): Set HAS_SYMS if there are external

	* nlmcode.h (nlm_object_p): Set HAS_SYMS if there are external
	references.
	(nlm_swap_auxiliary_headers_{in,out}): The copyright length is
	only one byte.
	(nlm_get_symtab_upper_bound): Include debugging symbols in symbol
	count.
	(nlm_slurp_symbol_table): Make symlength unsigned.  Read debugging
	symbols as BFD local symbols.
	(nlm_write_object_contents): Don't bother writing out exported
	symbols more than once; they now appear in the symbol table more
	than once (with and without a prefix) if necessary.  Set offset
	values to be non-zero as NLMLINK does.