bfd/

	* elflink.c (elf_link_add_object_symbols): Don't create link dynamic
	sections immediately when linking shared libs.  Instead, wait until
	we know a lib is needed.
	(_bfd_elf_link_create_dynstrtab): Extract from..
	(_bfd_elf_link_create_dynamic_sections_): ..here.
	(elf_add_dt_needed_tag): Call _bfd_elf_link_create_dynstrtab and
	_bfd_elf_link_create_dynamic_sections.  Add abfd param.  Allow
	for non-existent .dynamic.
	(elf_link_output_extsym): Don't complain about undefined symbols
	in as-needed dynamic libs that aren't actually linked.
ld/
	* emultempl/elf32.em (gld${EMULATION_NAME}_try_needed): Formatting.
	(gld${EMULATION_NAME}_after_open): Ignore needed libs if they were
	only needed by an as-needed lib that didn't get linked.