* section.c (SEC_LINKER_MARK): Define.

	* section.c (SEC_LINKER_MARK): Define.
	* bfd-in2.h: Rebuild.
	* aoutx.h (NAME(aout,final_link)): Mark sections included in the
	link.
	(aout_link_input_bfd): Don't link unmarked sections.
	* cofflink.c (_bfd_coff_final_link): Mark sections included in the
	link.
	(_bfd_coff_link_input_bfd): Don't link unmarked sections.
	* coff-ppc.c (ppc_bfd_coff_final_link): Mark sections included in
	the link.
	* elflink.h (elf_bfd_final_link): Mark sections included in the
	link.
	(elf_link_input_bfd): Don't link unmarked sections.
	* xcofflink.c (_bfd_xcoff_bfd_final_link): Mark sections included
	in the link.
	(xcoff_link_input_bfd): Don't link unmarked sections.