sb2: Don't use 'realpath' anymore
sb2: Don't use 'realpath' anymore

- instead uses 'sb2-show realpath'. The 'realpath' utility
  may not be available everywhere.

h113331pp/scratchbox2,OlegGirko/ldbox,ldbox/ldbox,h113331pp/scratchbox2,OlegGirko/ldbox,h113331pp/scratchbox2,OlegGirko/ldbox,h113331pp/scratchbox2,ldbox/ldbox,ldbox/ldbox,h113331pp/scratchbox2,h113331pp/scratchbox2,OlegGirko/ldbox,OlegGirko/ldbox,ldbox/ldbox,ldbox/ldbox,ldbox/ldbox,OlegGirko/ldbox