Log Message:
Updating devel/p5-namespace-clean from 0.11 to 0.12

pkgsrc changes:
  - Adding right license definition
  - Adjusting dependencies

Upstream changes:
[0.12] Thu Jan 14 03:22:03 CET 2010
    - Stop relying on stash entries always being upgraded into real GVs
      (Zefram).
    - Work around $DB::sub (Yuval Kogman).
    - Fix restoring of non-code symbols when cleaning (Ben Morrows).