Update time/p5-DateTime from 0.5300 to 0.5400

pkgsrc changes:
- Adjust license definition
- Adjust dependencies

Upstream changes:
0.54  2010-03-14
- Bumped the DateTime::TimeZone prereq to 1.09 to force people to use a modern
  version. Previously the minimum version was 0.59, and there have been a lot
  of bug fixes since then.

- String overloading now extends to string comparison, so a DateTime object
  can be compared to any string. In other words

  if ( $dt eq $string ) { ... }

  will simply stringify $dt and then do a normal string-is-equals
  check. Previously, this would blow up unless both operands were a DateTime
  object.

  Note that future versions of Test::More (0.95_01+) will no longer stringify
  arguments to is(), which means that older versions of DateTime may cause new
  test failures when you upgrade Test::More. It is highly recommended that you
  upgrade DateTime before upgrading to Test::More 0.95_01+.

  Patch by Michael Schwern. RT #55453.

- Allow passing end_of_month setting to $duration->inverse(). Requested by
  John Siracusa. RT #53985.

(sno)