Support -alh and -ald for DWARF 1:
* listing.c (struct list_info_struct): Add debugging field.
(listing_newline): Initialize the debugging field. If ELF, if the
section starts with .debug or .line, set the debugging field in
the listing structure.
(debugging_pseudo): Add list parameter. Change all callers. If
the debugging field is set, consider it to be a debugging pseudo.
If ELF, skip blank lines between debugging lines.
* read.c (emit_expr): If ELF, look for line numbers.
(stringer): If ELF, look for file names.
PR 13210.