ReaR: Creating an ISO image with backup embedded fails with error "File ./backup/backup.tar.gz is larger than 4GiB-1."

Issue

• When embedding the backup archive in the rescue ISO, genisoimage aborts after displaying the error shown below

  genisoimage 1.1.11 (Linux)
  Scanning .
  Scanning ./backup
  File ./backup/backup.tar.gz is larger than 4GiB-1.
  -allow-limited-size was not specified. There is no way do represent this file size. Aborting.
  XXX_DATE_AND_TIME_XXX ERROR: Could not create ISO image (with /bin/mkisofs)
  ==== Stack trace ====
  Trace 0: /usr/sbin/rear:543 main
  Trace 1: /usr/share/rear/lib/mkbackup-workflow.sh:22 WORKFLOW_mkbackup
  Trace 2: /usr/share/rear/lib/framework-functions.sh:101 SourceStage
  Trace 3: /usr/share/rear/lib/framework-functions.sh:49 Source
  Trace 4: /usr/share/rear/output/ISO/Linux-i386/820_create_iso_image.sh:28 source
  Trace 5: /usr/share/rear/lib/_input-output-functions.sh:371 StopIfError
  Message: Could not create ISO image (with /bin/mkisofs)
  == End stack trace ==