Upgrade parrot from version 2.8.0 to 2.9.1.

Pkgsrc changes:
 o Adapt to changes in the set of installed files.

Upstream changes:

Parrot 2.9.1 News:

 - This is a bugfix release to address an excessive slowdown in
   the Rakudo Perl 6 build.  If you run out of memory on a box with
   < 512 MB physical RAM, please report it to us.

Parrot 2.9.0 News:

- Core
  + Parrot and Rakudo's build and tests can now be run under the profiling
    runcore
  + IPv6 is now detected, laying the groundwork for future networking
    improvements
  + mk_language_shell.pl and create_language.pl no longer require an
    installed parrot
  + String PMC's 'reverse' method is now faster and supports all encodings
  + improvements and simplifications in internal string processing
  + Added API for adding STRINGs to the gc root set
  + Speed up ord, substr, index and string comparison opcodes
- Testing
  + "make smoke" supports parallel testing by honoring TEST_JOBS
  + Added tests for Socket PMC, StringBuilder PMC, ByteBuffer PMC,
    mk_language_shell.pl, create_language.pl
  + Fixed "Configure.pl" about missing tests
  + Parrot and Rakudo Perl 6 now have access to the GCC Compile Farm
  + Testing on Darwin/PPC
- Git Migration
  + Most developer tools have been ported to Git
  + Majority of developer docs have been written for Git
- Platforms
  + Parrot can now be built on Minix

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