[MacPorts] #60389: opencv: update to 3.4.10

[MacPorts]

#60389: opencv: update to 3.4.10
--------------------------+--------------------
 Reporter:  chrstphrchvz  |      Owner:  (none)
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  opencv
--------------------------+--------------------
 3.4.10 was released 2020-04-06; version currently in MacPorts is 3.4.8
 (released 2019-11-12).

 (I currently do not need this port. I attempted updating it:
 https://github.com/macports/macports-ports/pull/6914, but gave up since
 patch-find-openexr.diff is outdated, and I'm not sure how it should be
 updated.)

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Ticket URL: <https://trac.macports.org/ticket/60389>
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