fdo#81336 bison priority increase with bigger number

Change-Id: Ib99f08c52379fd9df90c30b61cc246ee53022506
Reviewed-on: https://gerrit.libreoffice.org/10403
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>