Update parrot from version 2.4.0 to 2.5.0.

Pkgsrc changes:
 o Adapt PLIST and Makefile to what's in the package source and what
   is now being installed.

Upstream changes:
 * Core
   o Added ByteBuffer PMC to allow direct byte manipulation
   o Modified some PMC vtable functions to reduce complexity,
     simplifying coverage.
   o Modified PAST to generate symbolic PASM constants in PIR output.
   o General STRING API cleanups
   o Increased test coverage of core PMCs
   o Fixed up 'exit' opcode, added CONTROL_EXIT exception type.
   o Experimental 'unroll' opcode renamed to 'finalize'
 * NQP-rx
   o Added proper support for multisubs and multimethods
   o Fixed sigspace handling ** quantifier in regexes
   o Added \e strings
   o Added use of inversion lists for charclass lists in regexes
 * Platforms
   o EPEL (Extra Packages for Enterprise Linux) packages for
     RHEL6.beta are available
 * Begin moving towards Lorito, the ops refactor to enable pervasive
   self-hosting and JIT compilation.
   o All ops are now built with the self-hosted opsc compiler.
   o For more Information about Lorito see:
         + http://trac.parrot.org/parrot/wiki/Lorito
         + http://trac.parrot.org/parrot/wiki/LoritoRoadmap

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