FcDirCacheLoadFile - load a cache file
       #include <fontconfig.h>
       FcCache * FcDirCacheLoadFile(const FcChar8 *cache_file);
       (struct stat *file_stat);
       .fi
       This  function loads a directory cache from cache_file. If file_stat is
       non-NULL, it will be filled with the results of stat(2)  on  the  cache
       file.
       Fontconfig version 2.8.0
                               18 November 2009          FcDirCacheLoadFile(3)