Update Devel-PPPort to CPAN version 3.20

  [DELTA]

  3.20 - 2011-09-10

    * fix CPAN #56749: isASCII and isCNTRL macros are buggy
      (thanks to Karl Williamson for providing a patch and patiently
       waiting almost two years for me to integrate it)
    * fix CPAN #70427: RealPPPort.xs:1587: error: lvalue required as unary ‘&’ operand

  3.19_03 - 2011-04-13

    * keep up with latest core changes

  3.19_02 - 2010-03-07

    * fix a warning emitted by the test suite with older perls
    * added support for the following API
        newSVpvs_share
        get_cvn_flags
        get_cvs
      (thanks to Goro Fuji for providing a patch to
      implement all of these, fixes CPAN #47174)

  3.19_01 - 2010-02-20

    * fix CPAN #50763: mistaken use of $[
      (thanks to Zefram for spotting this)
    * remove spurious PUSHMARK from Perl_ppaddr_t
      (thanks to Gerard Goossen for providing a patch)
    * improved support for newer compilers in buildperl.pl
      (thanks to Philippe Bruhat (BooK) for providing a patch)
    * added support for the following API
        memEQs
        memNEs
    * lots of small toolchain updates

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