[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@…):

 > I had started work on update and automatic update already quite some
 time ago. But there were some issues with the build/linking so I never
 push these updates out. Feel free to fix these, but please make sure that
 the builds are really okay, that linking is okay and all dependencies are
 listed. Otherwise I will merge you proposal with what I have in work.

 Hi Petr, in order to remove the manual download requirement, I just need
 to know what the actual URL is for the files, that you only get after
 registering on their website. So, if you have that, we can try it out.

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Ticket URL: <https://trac.macports.org/ticket/50229#comment:4>
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