Bug#755355: lintian: New check for use of pyqtconfig

[Scott Kitterman <debian@kitterman.com>]

Package: lintian
Version: 2.5.25
Severity: wishlist

For applications that use python-qt4, pyqtconfig has been the standard way to
access attributes about the PyQt4 installation.  Upstream has decided to drop
this for alternate methodes.  For now, we can continue to use the upstream
legacy configure that still generates it, but post-Jessie, users of pyqtconfig
are going to have to be updated.

I thought it would be prudent to have a lintian tag now to warn maintainers
that this is coming in the future.  There are nearly 100 reverse-depends of
python-qt4 and many of them (I got tired of looking) will have a problem with
this.

I am happy to try and help implement this, but I've never done anything with
lintian before, so I'll need some guidance.