Update to 0.12
Update DEPENDS

Upstream changes:
0.12  Tue, 4 Dec 2012 20:13:00 +0000
  * Complete pure-perl implementation in addition to the one based on
    Variable::Magic. You can specify the implementation explicitly by
    use-ing B::Hooks::EndOfScope::PP or B::Hooks::EndOfScope::XS, or
    by setting $ENV{B_HOOKS_ENDOFSCOPE_IMPLEMENTATION} to either 'XS'
    or 'PP'
  * Switch from using Sub::Exporter to the more conservative
    Sub::Exporter::Progressive

(wen)