FcDirScan - scan a font directory without caching it
#include <fontconfig/fontconfig.h>
FcBool FcDirScan (FcFontSet *set, FcStrSet *dirs, FcFileCache *cache, FcBlanks *blanks, const FcChar8 *dir, FcBool force);
If cache is not zero or if force is FcFalse, this
function currently returns FcFalse. Otherwise, it scans an entire directory
and adds all fonts found to set. Any subdirectories found are added
to dirs. Calling this function does not create any cache files. Use
FcDirCacheRead() if caching is desired.