[MacPorts] #38104: ninka: use variables for repeated values

[MacPorts]

#38104: ninka: use variables for repeated values
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 Reporter:  ryandesign@…  |      Owner:  and.damore@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:  haspatch      |       Port:  ninka
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 Here's a patch for your consideration that introduces two new variables to
 the portfile—datadir and docdir—and uses them throughout instead of
 repeating their values.

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Ticket URL: <https://trac.macports.org/ticket/38104>
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