Defines starting with `c' in pcfs

• CLUST_BAD pcfs/fat.h:30
• CLUST_EOFE pcfs/fat.h:32
• CLUST_EOFS pcfs/fat.h:31
• CLUST_FIRST pcfs/fat.h:27
• CLUST_FREE pcfs/fat.h:25
• CLUST_RSRVE pcfs/fat.h:29
• CLUST_RSRVS pcfs/fat.h:28