Log Message:
Update to 3.24. From the changelog:

* Remove SvREFCNT_dec_NN until it can be implemented
  properly.
  (Thanks to bulk88 for reporting GH #10)
* Fix GH #11 - compiler warning under clang
  (Thanks to jhi for reporting it)
* Fix GH #12 - compiler warnings
  (Thanks to jhi for reporting it)
* Add support for HeUTF8
* Add GetFileContents() to retrieve the contents of the
  ppport.h file
* Update MAX_VER to be 5.20
* Update issue tracker to GitHub
* Add support for the following API
    SvREFCNT_dec_NN
    mg_findext
    sv_unmagicext
* Update META
    Move bug tracker to github
    Provide link to repository
* Avoid syntax disallowed by C++11
  (Thanks to Tony C for the patch)
* 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