[MacPorts] #39577: py-icalendar: update to 3.4

[MacPorts]

#39577: py-icalendar: update to 3.4
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 Reporter:  jmr@…   |      Owner:  deric@…
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  py-icalendar
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 Released 2013-04-24:
 http://icalendar.readthedocs.org/en/latest/changelog.html#id1

 Please also review whether setuptools is used at runtime, and change it to
 depends_build if not.

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Ticket URL: <https://trac.macports.org/ticket/39577>
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