Update Digest-SHA to CPAN version 5.85

  [DELTA]

5.85  Wed Jun 26 04:05:26 MST 2013
  - workaround for repeated calls to shaclose (ref. Bug #86295)
    -- need to explicitly reset internal pointer to NULL
      ref. shaclose() in SHA.xs
  - corrected typos in shasum script
    -- ref. Bug #85430