Add case table for Deseret and Osage

For characters like these that are in Unicode's Supplementary
Multilingual Plane, only the low surrogate changes when changing case.

Change-Id: I2c4e9880b4c41a6ecfc333bb2710cf1db3f80da7
Reviewed-on: https://gerrit.libreoffice.org/85621
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>