Make kernelmemfs depend on kernel.ld

Makefile

@@ -123,7 +123,7 @@ kernel: $(OBJS) entry.o entryother initcode kernel.ld
 # great for testing the kernel on real hardware without
 # needing a scratch disk.
 MEMFSOBJS = $(filter-out ide.o,$(OBJS)) memide.o
-kernelmemfs: $(MEMFSOBJS) entry.o entryother initcode fs.img
+kernelmemfs: $(MEMFSOBJS) entry.o entryother initcode kernel.ld fs.img
 	$(LD) $(LDFLAGS) -T kernel.ld -o kernelmemfs entry.o  $(MEMFSOBJS) -b binary initcode entryother fs.img
 	$(OBJDUMP) -S kernelmemfs > kernelmemfs.asm
 	$(OBJDUMP) -t kernelmemfs | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernelmemfs.sym