add keynub-licdongle

[ab-tools]

Adds keynub-licdongle (Haskell client for the KeyNub USB license dongle, Hackage 1.1.1) under a new maintainer entry.

Checklist:

• Meaningful commit message, eg add my-cool-package (please don't mention build-constraints.yml)
• At least 30 minutes have passed since uploading to Hackage
• If applicable, required system libraries are added to 02-apt-get-install.sh or 03-custom-install.sh (not applicable: no C library at build time; the native library is loaded at run time and nothing is linked)
• (recommended) Package have been verified to work with the latest nightly snapshot, e.g by running the verify-package script
• (optional) Package is compatible with the latest version of all dependencies (Run cabal update && cabal outdated)

Verification: the Hackage tarball keynub-licdongle-1.1.1 was unpacked into a clean directory and built with GHC 9.12.4 and cabal 3.18 under the constraints of the nightly-2026-09-22 cabal.config, library and test suite, plus cabal haddock; cabal outdated reports all dependencies up to date. The dependencies are GHC boot packages only (base, bytestring, directory, filepath, unix or Win32; the test suite adds process). The same sources at this version build and pass their test suite on Linux, macOS and Windows with GHC 9.12 in the SDK's own CI.

keynub-licdongle is listed under skipped-tests: the test suite compiles a C stand-in from the SDK sources, which are not part of the Hackage package, so on the Stackage builders it would configure and build but exit non-zero. Move it to expected-test-failures if you prefer it there.

[mihaimaruseac]

Thank you!