fix: do not override existing libs

preserve existing newer libs under lib and libs dir

Signed-off-by: Caoruihong <crh.cao@huawei.com>
Change-Id: I5f91554890186f7760a73accb246240683b0558b

tools/scripts/make_rootfs/rootfsdir.sh

@@ -46,14 +46,14 @@ if [ -d "${BIN_DIR}" ] && [ "$(ls -A "${BIN_DIR}")" != "" ]; then
     for el in ${NEED_COPYTO_OUTDIR[@]}
     do
         if [ -e ${BIN_DIR}/$el ] && [ "${BIN_DIR}/$el" != "${OUT_DIR}/bin/$el" ]; then
-            cp -f ${BIN_DIR}/$el ${OUT_DIR}/bin/$el
+            cp -u ${BIN_DIR}/$el ${OUT_DIR}/bin/$el
         fi
     done
 fi
 cp -f ${LIB_DIR}/* ${ROOTFS_DIR}/lib
-cp -f ${LIB_DIR}/* ${OUT_DIR}/libs
+cp -u ${LIB_DIR}/* ${OUT_DIR}/libs
 
 if [ -e ${ETC_DIR} ]; then
 cp -f ${ETC_DIR}/.mkshrc ${ROOTFS_DIR}/etc
-cp -f ${ETC_DIR}/.mkshrc ${OUT_DIR}/etc
+cp -u ${ETC_DIR}/.mkshrc ${OUT_DIR}/etc
 fi