bug#22808: Add a function to simplify many of the new python2-foo definitions

[Ludovic Courtès]

Christopher Allan Webber <address@hidden> skribis:

> Right now we have a lot of these that look very similar:
>
>   (define-public python2-chardet
>     (package
>       (inherit (package-with-python2
>                 (strip-python2-variant python-chardet)))
>       (native-inputs `(("python2-setuptools" ,python2-setuptools)))))

Right, we discussed before adding the python2-setuptools dependency
automatically as part of ‘package-with-python2’.  I think this would be
a good idea, indeed.

We need to see if there are exceptions to this rule.

Any takers?  :-)

Ludo’.