Update Digest-SHA to CPAN version 5.82

  [DELTA]

  5.82  Thu Jan 24 04:54:12 MST 2013
    - introduced workaround to SvPVbyte bug in Perl 5.6
        -- module behavior now consistent under all Perls 5.6+
            -- ref: new test script t/unicode.t
        -- SHA routines now always croak on wide chars (5.6+)
    - removed "static" message schedules from C code
        -- default "auto" is now just as fast
        -- thread-safe option (-t) no longer necessary
            -- still allowed, but ignored
        -- simplifies source and header files
            -- eliminates SHA_STO_CLASS and SHA_THREAD_SAFE
            -- ref. Bug #82784
        -- thanks to Steve Hay for initial patch
    - provided documentation to describe Unicode handling
        -- ref: Bug #82378
    - updated documentation of NIST statement on SHA-1