kubuntu ci patches series ignore

[Harald Sitter]

as you hopefully all know kubuntu ci checks if a patch is actually
listed in series. this now also has an override mechanic [1] since we
need it for kdepim

debian/patches/ignore

exactly the same format as the series itself. all patches listed in
ignore are not being complained about

more information
https://community.kde.org/Kubuntu/CI/PatchesSeriesIgnore

[1] http://anonscm.debian.org/cgit/pkg-kde/ci-tooling.git/commit/?id=ec7b353ca1890a5cc22951b27070b7d178156cf0