[MacPorts] #42069: py-libxml2 @2.9.1: add python32 and python33 subports

[MacPorts]

#42069: py-libxml2 @2.9.1: add python32 and python33 subports
------------------------+--------------------------------
 Reporter:  zpeeters@…  |      Owner:  macports-tickets@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.2.1
 Keywords:  haspatch    |       Port:  py-libxml2
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 Since version 2.9.1 libxml2 supports Python 3.X. I have tested python 3.2
 and 3.3 (and 2.7). Python 3.1 and 3.4 may also work. All tests in
 ${worksrcpath}/tests return "OK". libxml2mod imports without error (i.e. I
 cannot reproduce ticket [https://trac.macports.org/ticket/39579 #39579]).

 In addition, changed url for master_sites and livecheck.url.

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Ticket URL: <https://trac.macports.org/ticket/42069>
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