Defines starting with `f' in quakeworld

• FLOODFILL_FIFO_MASK quakeworld/client/gl_model.c:1372
• FLOODFILL_FIFO_SIZE quakeworld/client/gl_model.c:1371
• FRAMECOUNT_MASK quakeworld/client/r_draw.c:31
• FULLY_CLIPPED_CACHED quakeworld/client/r_draw.c:30
• fv_flags quakeworld/client/d_ifacea.h:66
• fv_reserved quakeworld/client/d_ifacea.h:67
• fv_shift quakeworld/client/d_ifacea.h:69
• fv_size quakeworld/client/d_ifacea.h:68
• fv_v quakeworld/client/d_ifacea.h:63