Drop removal of calculated basename from readelf output. (Closes:...

Drop removal of calculated basename from readelf output. (Closes: #394)

I don't think readelf includes the name anymore, at least how diffoscope calls it:

         if (optind < (argc - 1))
           /* When displaying information for more than one file,
              prefix the information with the file name.  */
           show_name = true;
           ...