Obviously there are more improvements that can be done here,
especially moving headers to .dev, but that's not entirely trivial and
probably not worth it since kde4 is old.
Fixes#17346.
The kdelibs setup hook unnecessarily propagates kdelibs into the system
environment, leading to KDE 4 services running in a KDE 5 session.
- Update from Applications 16.04.2 to 16.04.3.
- Remove the version number from the directory storing the Applications
Nix expressions. It is not necessary to version the Nix expressions
now that we keep only one version in Nixpkgs.
- Fix a bug in generate-kde-applications.sh which prevented it from
finding its helper script.
- Automatically redirect the output of generate-kde-applications.sh to
make the update script even easier to use.
