Bug#945223: cracklib2: needs an explicit build dependency on dh-python

[Graham Inggs]

Package: cracklib2
Version: 2.9.6-3
Severity: serious
Tags: ftbfs
python3-all and python3-dev now dropped the dependency on dh-python:

[ Piotr Ożarowski ]
   * Remove dh-python dependency from python3-all and python3-dev packages.
     Packages should build depend on dh-python or dh-sequence-python3 
instead.

Please add an explicit build dependency on dh-python.