Debian packaging: Drop obsolete popt paragraph

[martinpitt]

popt got removed in commit 69bc3844de9b2b

[packit-as-a-service[bot]]

Congratulations! One of the builds has completed. :champagne:

You can install the built RPMs by following these steps:

• sudo yum install -y dnf-plugins-core on RHEL 8
• sudo dnf install -y dnf-plugins-core on Fedora
• dnf copr enable packit/sgallagher-sscg-53
• And now you can install the packages.

Please note that the RPMs should be used only in a testing environment.