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       FcUcs4ToUtf8 - convert UCS4 to UTF-8
       #include <fontconfig.h>
       int FcUcs4ToUtf8 (FcChar32src, FcChar8dst[FC_UTF8_MAX_LEN]);
       Converts  the  Unicode char from src into dst and returns the number of
       bytes needed to encode the char.
       Fontconfig version 2.2.0
                                 21 April 2003                 FcUcs4ToUtf8(3)