[MacPorts] #55315: opencv: please update to 3.3.1

[MacPorts]

#55315: opencv: please update to 3.3.1
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 Reporter:  gallafent  |      Owner:
     Type:  update     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  opencv
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 As per https://github.com/opencv/opencv/releases/tag/3.3.1 there is a new
 minor version (and a patchlevel to boot) of this library available, which
 it would be nice to see available via MacPorts! :)

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Ticket URL: <https://trac.macports.org/ticket/55315>
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