* targets.c (BFD_JUMP_TABLE_ARCHIVE): Add _update_armap_timestamp.

	* targets.c (BFD_JUMP_TABLE_ARCHIVE): Add _update_armap_timestamp.
	(bfd_target): Add field _bfd_update_armap_timestamp.
	* bfd.c (bfd_update_armap_timestamp): Define.
	* bfd-in2.h: Rebuilt.
	* libbfd-in.h (_bfd_noarchive_update_armap_timestamp): Define.
	(_bfd_archive_bsd_update_armap_timestamp): Declare.
	(_bfd_archive_coff_update_armap_timestamp): Define.
	* libbfd.h: Rebuilt.
	* archive.c (_bfd_write_archive_contents): Call
	bfd_update_armap_timestamp instead of checking for a BSD archive
	and calling bsd_update_armap_timestamp.
	(_bfd_archive_bsd_update_armap_timestamp): Rename from
	_bsd_update_armap_timestamp.  Don't assume that armap_datepos is
	already set.
	* aout-target.h (MY_update_armap_timestamp): Define if not already
	defined.
	* coff-rs6000.c (rs6000coff_update_armap_timestamp): Define.
	* ieee.c (ieee_update_armap_timestamp): Define.
	* libecoff.h (_bfd_ecoff_update_armap_timestamp): Define.
	* oasys.c (oasys_update_armap_timestamp): Define.
	* som.c (som_update_armap_timestamp): Define.