[MacPorts] #44103: Coin: update information in the portfile, add livecheck, avoid /usr/X11R

[MacPorts]

#44103: Coin: update information in the portfile, add livecheck, avoid /usr/X11R
----------------------+-------------------
  Reporter:  mojca@…  |      Owner:  css@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  Coin     |
----------------------+-------------------

Comment (by khindenburg@…):

 After r122278, does the bitbucket fetch work for anyone?

 https://bitbucket.org/Coin3D/coin/downloads/coin-3.1.3.tar.gz is from the
 distfile and it fails here.

 it should be

 https://bitbucket.org/Coin3D/coin/downloads/Coin-3.1.3.tar.gz

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Ticket URL: <https://trac.macports.org/ticket/44103#comment:3>
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