Silence lintian on debian-revision-should-not-be-zero. As this is no Debian packaging repository, but ,,NX (redistributed)'', we will always release with rev no. set to ,,0''.

Update patch: 017_nx-x11_update-autotools-helper-files.patch. Add lintian override to source.lintian-overrides: ancient-autotools-helper-file as we handle autotools helper file updates via patch system.

Add lintian-override: outdated-autotools-helper-file to source.lintian-overrides as we patch-update the outdated helper files before building binaries.