Update Devel-PPPort to CPAN version 3.21

[DELTA]

3.21 - 2013-08-17

    * Fix cpan #87870: Merge core perl commit 90b0dc0e2e
      (Thanks to Father Chrysostomos for the original patch and
       to Steve Hay for forwarding it)
    * Fix cpan #86975: Deterministically order API elements in POD
      (Thanks to Karl Williamson for providing a patch.)
    * Fix cpan #81796: my $_ is deprecated
      (Thanks to Nicholas Clark for providing a patch)
    * Fix cpan #81484: fix isASCII and isCNTRL for inputs > 255
      (Thanks to Karl Williamson for providing a patch)
    * Fix cpan #80314: make use of PERL_NO_GET_CONTEXT the default
    * Fix cpan #79814: Install to 'site' for perl 5.11+
      (Thanks to Robert Sedlacek for providing a patch)
    * Fix cpan #78271: Need SvPV_nomg_nolen
    * Adapt buildperl.pl for newer Perl releases
    * Update masked_versions regex for 5.005 thread builds
    * Some tweaks needed to support 5.003 on 64-bit platforms
Turn off executable bit accidentally added to Devel-PPPort files
Update Maintainers.pl etc for Devel-PPPort upgrade to 3.21

In particular, the customizations to four files have now been merged
upstream so we must remove their entries from customized.dat
perldelta - Devel::PPPort upgrade