How to Git Clone Subrepo for Build (opencv-python)

[Steven Smith]

The opencv-python package needs to clone a subrepo of opencv4 as part of the build. See:

https://pypi.org/project/opencv-python/
https://github.com/skvark/opencv-python

How should this be done within a Portfile? Effectively, `git clone https://github.com/opencv/opencv.git` must be run in the pre-build stage.

It must be a proper git repo—installing the opencv4 port isn’t enough.
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