[MacPorts] #63523: omniORB @4.2.4: update omniORB and python version support

[MacPorts]

#63523: omniORB @4.2.4: update omniORB and python version support
-----------------------+----------------------
  Reporter:  lockhart  |      Owner:  (none)
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.1
Resolution:            |   Keywords:  haspatch
      Port:  omniORB   |
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Changes (by lockhart):

 * Attachment "Portfile.omniORB" added.

 Updated portfile for the newest version of omniorb and adding support for
 python 3.7, 3.8, and 3.9

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Ticket URL: <https://trac.macports.org/ticket/63523>
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