Update bundled Graphite to 1.2.4

Change-Id: Id8c90b58c40bd449617c58f6c9e7cdea035a1c41
Reviewed-on: https://gerrit.libreoffice.org/7056
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>