-Werror,-Wunused-const-variable

Change-Id: I2ace311bc1fe66329a7833e602820f275a7dbd04
Reviewed-on: https://gerrit.libreoffice.org/12422
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>