Updating www/p5-HTTP-DAV from 0.38 to 0.40

pkgsrc changes:
- Adjust license definition

Upstream changes:
  v0.40 (released 2010/01/27):
    *  bug fixes
  - Fixed RT #47500 (http://rt.cpan.org/Public/Bug/Display.html?id=47500),
            HTTP::DAV::Comms->credentials() method erroneously autovivified
            basic authentication internal values, causing wrong or undefined
            credentials to be sent out, or credentials to be "forgot" by HTTP::DAV.
Thanks to stoian.iovchev at imperia.bg and Glenn Fowler for their
feedback on this.

  v0.39 (released 2009/12/12):
    *  bug fixes
          - Fixed RT #52665 (http://rt.cpan.org/Public/Bug/Display.html?id=52665),
            Using dave or propfind() on URLs containing escaped chars (%xx) could fail,
            due to upper/lower case differences. Thanks to cebjyre for the patch
            and the test case.

(sno)