[perl #60654] [DEPRECATED] Closure PMC

# New Ticket Created by  Patrick R. Michaud 
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The new lexicals implementation no longer requires (or wants)
a Closure PMC, and IMCC will no longer produce Closure PMCs.
Instead, all Sub PMCs (and their subclasses) will have the 
ability to have outer lexical scopes.

The Closure PMC will likely be removed (or at least disabled)
in the December 2008 release.

Thanks,

Pm