...instead of through ../../... paths.  Change done in preparation of
loplugin:includeform.

Change-Id: I1b4476f32573c2ef19d2a145e6e617b63006d40b
Reviewed-on: https://gerrit.libreoffice.org/43562Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>