Various version constraints can be removed because they reference package versions that are available since old-old-old-stable (Debian 6 squeeze).
For the record, Debian 6 squeeze has:
- adduser: 3.113+nmu3
- dpkg, dpkg-dev: 1.17.27
- libpam-modules: 1.1.8-3.1+deb8u2+b1
- libpam-runtime: 1.1.8-3.1+deb8u2
- lsb-base: 4.1+Debian13+nmu1
- ucf: 3.0030
- zlib1g-dev: 1:1.2.8.dfsg-2+b1