To rebuild unicode-char-cases.ss and unicode-charinfo.ss, download into
./UNIDATA the following files:

http://www.unicode.org/Public/UCD/latest/ucd/CompositionExclusions.txt
http://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt
http://www.unicode.org/Public/UCD/latest/ucd/CaseFolding.txt
http://www.unicode.org/Public/UCD/latest/ucd/SpecialCasing.txt
http://www.unicode.org/Public/UCD/latest/ucd/auxiliary/WordBreakProperty.txt
http://www.unicode.org/Public/UCD/latest/ucd/PropList.txt
http://www.unicode.org/Public/UCD/latest/ucd/NormalizationTest.txt
http://www.unicode.org/Public/UCD/latest/ucd/auxiliary/GraphemeBreakProperty.txt
http://www.unicode.org/Public/UCD/latest/ucd/emoji/emoji-data.txt

Then run 'make'.
