[MacPorts] #42071: mesa @8.0.4: add python32 and python33 variants

[MacPorts]

#42071: mesa @8.0.4: add python32 and python33 variants
-------------------------+--------------------------------
 Reporter:  zpeeters@…   |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.2.1
 Keywords:  haspatch     |       Port:  mesa
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 With python 3 support for py-libxml2 (see ticket
 [https://trac.macports.org/ticket/42069 #42069]), mesa can now also be
 build with python 3. I've tested python 3.2 and 3.3, 3.1 and 3.4 probably
 also work.

 This gets rid of the last reason to hang on to python 2.7, for me at
 least.

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Ticket URL: <https://trac.macports.org/ticket/42071>
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