kdePackages.extra-cmake-modules: stop propagating userEnvPkgs

This is stupid. We should not be doing this. I'm sure we're about
to find that it's somehow load bearing.

pkgs/kde/frameworks/extra-cmake-modules/ecm-hook.sh

···
             break
         fi
     done
-
-    if [ -d "$1/share/dbus-1" ]
-    then
-        appendToVar propagatedUserEnvPkgs "$1"
-    fi
 }
 addEnvHooks "$hostOffset" ecmHostPathHook