Bug#983496: allow to build without the udeb package

[Matthias Klose]

Package: src:iprutils
Version: 2.4.18.1-2
Tags: patch

allow to build without the udeb package.

patch at
http://launchpadlibrarian.net/524968683/iprutils_2.4.18.1-2build1_2.4.18.1-2ubuntu1.diff.gz