* elflink.c (_bfd_elf_check_kept_section): Test for kept group

	* elflink.c (_bfd_elf_check_kept_section): Test for kept group
	section.  Save result of checks in kept_section.
	(_bfd_elf_section_already_linked): Tidy.  Correct comments.
	Ignore all group member sections.  Handle special matching of
	single-member groups against linkonce sections via their group
	section.  When such a match is found, set kept_section to the
	group member section rather than to the group.