【完善】Scons 编译脚本，增加 lib/timeutils 。

Signed-off-by: armink <armink.ztl@gmail.com>

SConscript

@@ -10,6 +10,7 @@ src    += Glob('lib/utils/*.c')
 src    += Glob('extmod/*.c')
 src    += Glob('port/*.c')
 src    += Glob('lib/netutils/*.c')
+src    += Glob('lib/timeutils/*.c')
 src    += Glob('drivers/bus/*.c')
 
 path    = [cwd + '/']