Add Old Hungarian letters and numbers (now adwaita overwrite the unicode standard)

[kovacshviktor]

The Adwaita project implements to Unicode u10C80-U10CFF codepage as musical notes area.
This described by Unicode as Old Hungarian letters since Unicode 8.0

www.unicode.org/charts/PDF/U10C80.pdf

[be5invis]

For incorrect implementation in Adwaita, please file bug to Adwaita project instead.

[kovacshviktor]

I close it!