* objdump.c (display_file_offsets): New variable.

* objdump.c (display_file_offsets): New variable.
  (long_options): Add -F/--file-offsets.
  (objdump_print_addr_with_sym): If displaying file offsets, print
  the offset of the given address.
  (disassemble_bytes): If displaying file offsets, tell the user how
  many zeroes are skipped and the file offset of the point where
  dumping resumes.
  (disassemble_section): Only display the name of the section if
  data is going to be dumped from it.
  (main): Handle new option.  Produce error messages if the start or
  stop addresses do not make sense.
  * doc/binutils.texi: Document the new feature.
  * NEWS: Mention the new feature.