fdo#81516 Support fonts like Source Han Sans with > 16 FDArray elements

Change-Id: I3f82574f434060d62dc3faeb730341c5b169ce9f
(cherry picked from commit 3b38a2342e48a2aec3c2e4f5aebf883db4b84101)
Reviewed-on: https://gerrit.libreoffice.org/10745
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>