Regenerate the local settings recompilation rule when cmake is re-run

and ensure that we pull in all the dependencies.

This fixes the case where a new gsettings schema got added for building but it wasn't recompiled locally, which could cause test failures because ... gsettings.

(LP: #1046701). Fixes: https://bugs.launchpad.net/bugs/1046701. Approved by Daniel van Vugt, jenkins.