It is not clear how to remove a file:
REMOVE_FILES=openoffice/images/dialogh.png.
Let it for now in place.

Change-Id: Ie8739fd207ca7dc9343c92c93cf092b3af674bf0
Reviewed-on: https://gerrit.libreoffice.org/753Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>