Bug#604167: please extend old-versioned-python-dependency tag's description [dh_python2]

[Piotr Ożarowski <piotr@debian.org>]

Package: lintian
Version: 2.4.3
Severity: minor

dh_python2 adds "python (<< 2.X)" to Depends even in architecture
independent packages (due to symlinks included in the deb instead of
generating them at install time) *if* it cannot add something to Breaks
via ${python:Breaks}. 

Please suggest to add "Breaks: ${python:Breaks}" to resolve
old-versioned-python-dependency warning if dh_python2 is used, i.e. in
debian/rules there's:
* dh_python2 call, or
* dh is invoked with "--with python2" argument, or
* CDBS's DEB_PYTHON_SYSTEM is set to "python2" (not yet in cdbs package)

just mentioning dh_python2 and not checking if it's used is fine as
well, IMHO

TIA