* elf.c (bfd_section_from_shdr): When using a different section

	* elf.c (bfd_section_from_shdr): When using a different section
	header, pass the new one to _bfd_elf_make_section_from_shdr.
	(elf_fake_sections): Don't set sh_info and sh_entsize fields.
	(elf_map_symbols): Add section VMA to symbol value when comparing
	against 0.
	(_bfd_elf_compute_section_file_positions): Only build symbol table
	if there are some symbols.  Set file offset of symtab and strtab
	sections.
	(assign_file_positions_except_relocs): Remove dosyms parameter.
	Change all callers.  Never set file offset of symtab and strtab
	sections.
	(_bfd_elf_copy_private_section_data): New function.
	(MAP_ONESYMTAB, MAP_DYNSYMTAB, MAP_STRTAB, MAP_SHSTRTAB): Define.
	(_bfd_elf_copy_private_symbol_data): New function.
	(swap_out_syms): Check for special mapping of st_shndx created by
	copy_private_symbol_data.
	* elfxx-target.h: Use new copy routines.
	* elf-bfd.h (_bfd_elf_copy_private_symbol_data): Declare.
	(_bfd_elf_copy_private_section_data): Declare.