PR binutils/11983

	PR binutils/11983
	* archive.c (_bfd_get_elt_at_filepos): Store a copy of the
	filename in the bfd's filename field.
	* elfcode.h (bfd_from_remote_memory): Likewise.
	* ieee.c (ieee_object_p): Likewise.
	* mach-o.c (bfd_mach_o_fat_member_init): Likewise.
	* oasys.c (oasys_openr_next_archived_file): Likewise.
	* vms-lib.c (_bfd_vms_lib_get_module): Likewise.
	* opncls.c (bfd_fopen): Likewise.
	(bfd_openstreamr): Likewise.
	(bfd_openr_iovec): Likewise.
	(bfd_openw): Likewise.
	(bfd_create): Likewise.
	(_bfd_delete_bfd): Free filename.