Typedefs starting with `f' in BSD4-4

• fd_mask sys/types.h:122
• fdntype miscfs/fdesc/fdesc.h:62
• fd_set sys/types.h:131
• fhandle_t sys/mount.h:235
• FINFO ufs/lfs/lfs.h:73
• fixpt_t sys/types.h:58
• fsid_t sys/mount.h:40