bfd/

bfd/
	PR ld/11304
	* elf.c (_bfd_elf_init_private_section_data): Rename need_group
	to final_link and invert.  For final link allow some flags to
	differ.  Don't specially allow flags to be all zero.
ld/
	* ldlang.c (init_os): Remove isec param.  Don't check for
	bfd_section already set or call bfd_init_private_section_data
	here.
	(exp_init_os): Update init_os call.
	(lang_add_section): Tidy.  Really don't set SEC_LINK_ONCE
	flags.  Call bfd_init_private_section_data here.
	(map_input_to_output_sections): Tidy.  Update init_os calls.
	Use os->sectype to select sec flags for lang_data_statement.