reduce the warning output info  when run autobuild.sh
TODO: kill all warning when ucore is correct.
 On branch amd64-smp
 Changes to be committed:
   (use "git reset HEAD <file>..." to unstage)

	modified:   autobuild.sh
	modified:   ucore/Makefile
	modified:   ucore/src/kern-ucore/arch/amd64/Makefile.image
	modified:   ucore/src/kern-ucore/arch/i386/Makefile.image
	modified:   ucore/src/kern-ucore/fs/fatfs/ffs_fs.c
	modified:   ucore/src/kern-ucore/kmodule/mod.h
	modified:   ucore/src/kern-ucore/mm/pmm.c
	modified:   ucore/src/kern-ucore/mm/vmm.c
	modified:   ucore/src/kern-ucore/process/proc.c
	modified:   ucore/src/user-ucore/tests/time.c