[MacPorts] #50229: py-ngl: use compilers portgroup; update and download automatically

[MacPorts]

#50229: py-ngl: use compilers portgroup; update and download automatically
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  Reporter:  dstrubbe@…   |      Owner:  petr@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:               |   Keywords:  haspatch
      Port:  py-ngl       |
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Comment (by dstrubbe@…):

 Build and installation worked fine for me, using ncarg @6.3.0_6+gcc5. I
 just added a test phase, though it doesn't work for me. It says unable to
 import Ngl.

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Ticket URL: <https://trac.macports.org/ticket/50229#comment:7>
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