Python port group overwrites CMAKE_MAKE_PROGRAM, breaks configure in opencv4

[Steven Smith]

I’m trying to build python wrappers in the opencv4 Portfile. Port opencv4 uses the cmake 1.1 port group.

The issue I’m running into is that when I add the port group python, the environment variable CMAKE_MAKE_PROGRAM is defined as `python setup.py --no-user-cfg` (actual -D option below), and this breaks the configure stage.

How should this be prevented when the port groups cmake and python are used together, and configure should use make, not python?

-DCMAKE_MAKE_PROGRAM=/opt/local/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 setup.py --no-user-cfg
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