Generating GHC's Unicode table
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WCsubst.c is generated with:

    sh ubconfc 12.0.0 < UnicodeData.txt > WCsubst.c

where UnicodeData.txt came from

    https://www.unicode.org/Public/12.0.0/ucd/UnicodeData.txt

Don't forget to mention the update in the User's Guide.
