Updating devel/p5-Contextual-Return from 0.2.1 to 0.003.001

pkgsrc changes:
- add license definition

Upstream changes:
0.003001  Tue Jun 22 17:20:36 2010
    - Added Contextual::Return::FREEZE and Contextual::Return::DUMP
      to facilitate debugging
    - General clean-and-tighten of documentation
    - Added CLEANUP blocks
    - Added PUREBOOL context
    - [BACKWARDS INCOMPATIBLE CHANGE] Changed export interface
    - Added warning about (mis)behaviour of LVALUE, RVALUE, NVALUE
      under the debugger (thanks Steven)
    - Documented METHOD handlers

(sno)