[Git][debian-gis-team/saga][experimental] Add dh-python

[Sebastiaan Couwenberg]

You'll need to add --with python3 to d/rules too, and the overrides 
needs to be restored.

I've pushed fixes for this and the other issues raised in:

 
https://alioth-lists.debian.net/pipermail/pkg-grass-devel/2022-April/094200.html

That fixes a lot of lintian issues, but not:

  I: saga source: quilt-patch-missing-description 
debian/patches/python_fix.patch

Please fix that by adding DEP3 headers to the patch.

Kind Regards,

Bas

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