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.