... in the base class BuilderBase, in order to reuse it in
QtBuilder in an upcoming commit.
Change-Id: Ia115804a9d2bf22b47afb94d97109e9495b21cd4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/175530
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>