Updating devel/p5-Devel-Caller from 2.03nb1 to 2.04

pkgsrc changes:
- Apply update from PR pkg/42831
- Add license definition

Upstream changes:
2.04 Tuesday 16th February, 2010
Use CxTYPE macro rather than directly inspecting cx->cx_type
http://rt.cpan.org/Public/Bug/Display.html?id=33005

(sno)