Updating devel/p5-MooseX-Method-Signatures from 0.29 to 0.30

pkgsrc changes:
- Adjust dependency to MooseX::Types::Structured

Upstream changes:
0.30  Thu, 04 Feb 2010 02:41:36 +0100
  * Make Any instead of Defined the default type constraint.
  * Add tests for coercing optional named parameters (Cory Watson).
    + Make those tests pass by depending on
      MooseX::Types::Structured 0.20.
  * Make sure Text::Balanced doesn't screw up our data.

(sno)