Defines starting with `f' in pcfs

• FAT12_MASK pcfs/fat.h:34
• FAT16_MASK pcfs/fat.h:35
• FAT_GET pcfs/fat.h:52
• FAT_GET_AND_SET pcfs/fat.h:54
• FAT_SET pcfs/fat.h:53
• FCE_EMPTY pcfs/denode.h:95
• FC_LASTFC pcfs/denode.h:93
• FC_LASTMAP pcfs/denode.h:92
• FC_SIZE pcfs/denode.h:91
• FOUND pcfs/pcfs_lookup.c:64