Log Message:
Update p5-XML-Simple to 2.12.  Distfile for 2.07 has vanished from the mirrors.

Relevant changes since 2.07:
      - added NumericEscape option
      - added ValueAttr option (patch from Anton Berezin)
      - suppress 'wide character in print' warning (reported by Dawei Lin)
      - Added AttrIndent option (patch from Volker Moell)
      - Hash keys are now sorted alphabetically by default; enable the
        new NoSort option if you don't want this (patch from Volker Moell)
      - Fixed bug where disabling array folding broke anonymous array handling
      - Fixed bug when unfolding a tied hash
      - SuppressEmpty patch from Douglas Wilson
      - POD update re XMLin(XMLout($data)) caveats (bug report from Slaven
        Rezic)
      - fixed hash ordering assumption in test script (reported by Michel
        Rodriguez)
      - fixed variable expansion not happening in attributes (patch from Paul
        Bussé)