[MacPorts] #46260: nwntools: use python 2.7, fix build

[MacPorts]

#46260: nwntools: use python 2.7, fix build
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 Reporter:  jmr@…     |      Owner:  sumpfork@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.3.3
 Keywords:  haspatch  |       Port:  nwntools
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 Python 2.4 is due to be removed at the end of the year. Its dependents
 thus need to switch to a current python version. Also, nwntools needs some
 fixes to build with recent bison and compilers.

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Ticket URL: <https://trac.macports.org/ticket/46260>
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