gunicode: Update to Unicode 15.1.0
This includes the update to Unicode 15.1.0 generated by update-unicode-data.sh
, plus some manual changes (and new API) to add support for new line-break types. (See https://unicode.org/reports/tr14/.)
Signed-off-by: Philip Withnall pwithnall@endlessos.org
Fixes: #3112 (closed)
Closes #3112 (closed)