This forces github.com/opencv/opencv-python to only install the
files that don't exist in the other preexisting
termux opencv and opencv-python packages, i.e. *dist-info folders.

--- a/setup.py
+++ b/setup.py
@@ -271,7 +271,7 @@ def main():
         description="Wrapper package for OpenCV python bindings.",
         long_description=long_description,
         long_description_content_type="text/markdown",
-        packages=packages,
+        packages={},
         package_data=package_data,
         maintainer="OpenCV Team",
         ext_modules=EmptyListWithLength(),
@@ -378,6 +378,7 @@ class RearrangeCMakeOutput:
                     subpackage\
                         etc.
         """
+        return
 
         cls = self.__class__