Replace unicode files with ones that provide better terms of use
Identical files but these have the unicode terms-of-use (SPDX: Unicode-TOU) instead of some old license format.
https://www.unicode.org/Public/MAPPINGS/ISO8859/8859-1.TXT
https://www.unicode.org/Public/MAPPINGS/OBSOLETE/EASTASIA/JIS/JIS0201.TXT
https://www.unicode.org/Public/MAPPINGS/VENDORS/MISC/KOI8-R.TXT
cc @alanc
Edited by Peter Hutterer